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SAR(1)                        Linux User's Manual                       SAR(1)



NAME
       sar - Collect, report, or save system activity information.

SYNOPSIS
       sar  [ -A ] [ -b ] [ -B ] [ -C ] [ -d ] [ -h ] [ -i interval ] [ -m ] [ -p ] [ -q ]
       [ -r ] [ -R ] [ -S ] [ -t ] [ -u [ ALL ] ] [ -v ] [ -V ] [ -w ] [ -W ] [ -y ] [  -j
       {  ID  |  LABEL  | PATH | UUID | ... } ] [ -n { keyword [,...] | ALL } ] [ -I { int
       [,...] | SUM | ALL | XALL } ] [ -P { cpu [,...] | ALL } ] [ -o [ filename ] | -f  [
       filename  ]  ]  [  --legacy  ] [ -s [ hh:mm:ss ] ] [ -e [ hh:mm:ss ] ] [ interval [
       count ] ]

DESCRIPTION
       The sar command writes to standard  output  the  contents  of  selected  cumulative
       activity counters in the operating system. The accounting system, based on the val-
       ues in the count and interval parameters, writes information the  specified  number
       of  times  spaced at the specified intervals in seconds.  If the interval parameter
       is set to zero, the sar command displays the average statistics for the time  since
       the  system  was  started. If the interval parameter is specified without the count
       parameter, then reports are generated continuously.  The collected data can also be
       saved in the file specified by the -o filename flag, in addition to being displayed
       onto the screen. If filename is omitted, sar  uses  the  standard  system  activity
       daily  data  file,  the /var/log/sa/sadd file, where the dd parameter indicates the
       current day.  By default all the data available from the kernel are  saved  in  the
       data file.

       The  sar command extracts and writes to standard output records previously saved in
       a file. This file can be either the one specified by the -f flag  or,  by  default,
       the standard system activity daily data file.

       Without  the -P flag, the sar command reports system-wide (global among all proces-
       sors) statistics, which are calculated as averages for values expressed as percent-
       ages,  and  as  sums  otherwise.  If  the -P flag is given, the sar command reports
       activity which relates to the specified processor  or  processors.  If  -P  ALL  is
       given,  the sar command reports statistics for each individual processor and global
       statistics among all processors.

       You can select information about specific system activities using flags. Not speci-
       fying any flags selects only CPU activity.  Specifying the -A flag is equivalent to
       specifying -bBdqrRSvwWy -I SUM -I XALL -n ALL -u ALL -P ALL.

       The default version of the sar command (CPU utilization report) might be one of the
       first  facilities  the user runs to begin system activity investigation, because it
       monitors major system resources. If CPU utilization is near  100  percent  (user  +
       nice + system), the workload sampled is CPU-bound.

       If  multiple  samples and multiple reports are desired, it is convenient to specify
       an output file for the sar command.  Run the sar command as a  background  process.
       The syntax for this is:

       sar -o datafile interval count >/dev/null 2>&1 &

       All  data  is captured in binary form and saved to a file (datafile).  The data can
       then be selectively displayed with the sar command using the  -f  option.  Set  the
       interval and count parameters to select count records at interval second intervals.
       If the count parameter is not set, all the  records  saved  in  the  file  will  be
       selected.  Collection of data in this manner is useful to characterize system usage
       over a period of time and determine peak usage hours.

       Note:     The sar command only reports on local activities.


OPTIONS
       -A     This is equivalent to specifying -bBdqrRSuvwWy -I SUM -I XALL -n ALL -u  ALL
              -P ALL.

       -b     Report  I/O  and  transfer  rate  statistics.  The following values are dis-
              played:

              tps
                     Total number of transfers per second that  were  issued  to  physical
                     devices.  A transfer is an I/O request to a physical device. Multiple
                     logical requests can be combined into a single  I/O  request  to  the
                     device.  A transfer is of indeterminate size.

              rtps
                     Total  number of read requests per second issued to physical devices.

              wtps
                     Total number of write requests per second issued to physical devices.

              bread/s
                     Total  amount  of  data  read  from the devices in blocks per second.
                     Blocks are equivalent to sectors  with  2.4  kernels  and  newer  and
                     therefore have a size of 512 bytes. With older kernels, a block is of
                     indeterminate size.

              bwrtn/s
                     Total amount of data written to devices in blocks per second.

       -B     Report paging statistics. Some of the metrics below are available only  with
              post 2.5 kernels. The following values are displayed:

              pgpgin/s
                     Total  number  of kilobytes the system paged in from disk per second.
                     Note: With old kernels (2.2.x) this value is a number of  blocks  per
                     second (and not kilobytes).

              pgpgout/s
                     Total  number  of  kilobytes the system paged out to disk per second.
                     Note: With old kernels (2.2.x) this value is a number of  blocks  per
                     second (and not kilobytes).

              fault/s
                     Number  of page faults (major + minor) made by the system per second.
                     This is not a count of page faults that generate  I/O,  because  some
                     page faults can be resolved without I/O.

              majflt/s
                     Number  of  major  faults the system has made per second, those which
                     have required loading a memory page from disk.

              pgfree/s
                     Number of pages placed on the free list by the system per second.

              pgscank/s
                     Number of pages scanned by the kswapd daemon per second.

              pgscand/s
                     Number of pages scanned directly per second.

              pgsteal/s
                     Number of pages the system has reclaimed from  cache  (pagecache  and
                     swapcache) per second to satisfy its memory demands.

              %vmeff
                     Calculated as pgsteal / pgscan, this is a metric of the efficiency of
                     page reclaim. If it is near 100% then almost every  page  coming  off
                     the  tail  of  the  inactive list is being reaped. If it gets too low
                     (e.g. less than 30%) then the virtual memory is  having  some  diffi-
                     culty.  This field is displayed as zero if no pages have been scanned
                     during the interval of time.

       -C     When reading data from a file, tell sar to display comments that  have  been
              inserted by sadc.

       -d     Report  activity  for  each block device (kernels 2.4 and newer only).  When
              data is displayed, the device specification dev m-n is generally used (  DEV
              column).   m  is  the major number of the device.  With recent kernels (post
              2.5), n is the minor number of the device, but is  only  a  sequence  number
              with  pre  2.5 kernels. Device names may also be pretty-printed if option -p
              is used or persistent device names can be printed if option -j is used  (see
              below).  Values  for fields avgqu-sz, await, svctm and %util may be unavail-
              able and displayed as 0.00 with some 2.4 kernels.  Note that  disk  activity
              depends  on  sadc options "-S DISK" and "-S XDISK" to be collected. The fol-
              lowing values are displayed:

              tps
                     Indicate the number of transfers per second that were issued  to  the
                     device.   Multiple logical requests can be combined into a single I/O
                     request to the device. A transfer is of indeterminate size.

              rd_sec/s
                     Number of sectors read from the device. The size of a sector  is  512
                     bytes.

              wr_sec/s
                     Number  of sectors written to the device. The size of a sector is 512
                     bytes.

              avgrq-sz
                     The average size (in sectors) of the requests that were issued to the
                     device.

              avgqu-sz
                     The  average  queue  length  of  the requests that were issued to the
                     device.

              await
                     The average time (in milliseconds) for I/O  requests  issued  to  the
                     device  to be served. This includes the time spent by the requests in
                     queue and the time spent servicing them.

              svctm
                     The average service time (in milliseconds) for I/O requests that were
                     issued to the device.

              %util
                     Percentage  of  elapsed time during which I/O requests were issued to
                     the device (bandwidth utilization for the device). Device  saturation
                     occurs when this value is close to 100%.

       -e [ hh:mm:ss ]
              Set  the  ending  time  of  the report. The default ending time is 18:00:00.
              Hours must be given in 24-hour format.  This option can be  used  when  data
              are read from or written to a file (options -f or -o ).

       -f [ filename ]
              Extract records from filename (created by the -o filename flag). The default
              value of the  filename  parameter  is  the  current  daily  data  file,  the
              /var/log/sa/sadd file. The -f option is exclusive of the -o option.

       -h     Display a short help message then exit.

       -i interval
              Select  data records at seconds as close as possible to the number specified
              by the interval parameter.

       -I { int [,...] | SUM | ALL | XALL }
              Report statistics for a given interrupt.  int is the interrupt number. Spec-
              ifying  multiple -I int parameters on the command line will look at multiple
              independent interrupts.  The SUM keyword indicates that the total number  of
              interrupts received per second is to be displayed. The ALL keyword indicates
              that statistics from the first 16 interrupts are to be reported, whereas the
              XALL keyword indicates that statistics from all interrupts, including poten-
              tial APIC interrupt sources,  are  to  be  reported.   Note  that  interrupt
              statistics depend on sadc option "-S INT" to be collected.

       -j { ID | LABEL | PATH | UUID | ... }
              Display  persistent device names. Use this option in conjunction with option
              -d.  Options ID, LABEL, etc. specify the type of the persistent name.  These
              options  are  not limited, only prerequisite is that directory with required
              persistent names is present in /dev/disk.  If persistent name is  not  found
              for the device, the device name is pretty-printed (see option -p below).

       --legacy
              Enable  reading  older  /var/log/sa/sadd  data files.  In Red Hat Enterprise
              Linux 6.3, the sysstat package was updated to version 9.0.4-20. This  update
              changed  the  format  of /var/log/sa/sadd data files, but unfortunately, the
              format version was not updated. Because of this, sysstat  did  not  restrict
              reading  of  data files in old format and while interpreting them, some dis-
              played values could have been incorrect. The updated sysstat package in  Red
              Hat  Enterprise  Linux  6.5  contains fixed format version of data files and
              prevents reading data files created by  older  sysstat  packages.   However,
              data files created by the sysstat packages from Red Hat Enterprise Linux 6.3
              and 6.4 are fully compatible with the sysstat package from  Red  Hat  Enter-
              prise Linux 6.5. To enable latest sysstat to read older data files, use this
              option. Note that this option allows you to read also data files created  on
              Red  Hat Enterprise Linux 6.2 and earlier, however, these files are not com-
              patible with the latest sysstat package.

       -m     Report power management statistics.  Note that these  statistics  depend  on
              sadc option "-S POWER" to be collected.  The following value is displayed:

              MHz
                     CPU clock frequency in MHz.

       -n { keyword [,...] | ALL }
              Report network statistics.

              Possible keywords are DEV, EDEV, NFS, NFSD, SOCK, IP, EIP, ICMP, EICMP, TCP,
              ETCP, UDP, SOCK6, IP6, EIP6, ICMP6, EICMP6 and UDP6.

              With the DEV keyword, statistics from the network devices are reported.  The
              following values are displayed:

              IFACE
                     Name of the network interface for which statistics are reported.

              rxpck/s
                     Total number of packets received per second.

              txpck/s
                     Total number of packets transmitted per second.

              rxkB/s
                     Total number of kilobytes received per second.

              txkB/s
                     Total number of kilobytes transmitted per second.

              rxcmp/s
                     Number of compressed packets received per second (for cslip etc.).

              txcmp/s
                     Number of compressed packets transmitted per second.

              rxmcst/s
                     Number of multicast packets received per second.

              With  the  EDEV  keyword,  statistics  on failures (errors) from the network
              devices are reported.  The following values are displayed:

              IFACE
                     Name of the network interface for which statistics are reported.

              rxerr/s
                     Total number of bad packets received per second.

              txerr/s
                     Total number of errors that happened per  second  while  transmitting
                     packets.

              coll/s
                     Number  of  collisions  that  happened  per second while transmitting
                     packets.

              rxdrop/s
                     Number of received packets dropped per second because of  a  lack  of
                     space in linux buffers.

              txdrop/s
                     Number of transmitted packets dropped per second because of a lack of
                     space in linux buffers.

              txcarr/s
                     Number of carrier-errors that happened per second while  transmitting
                     packets.

              rxfram/s
                     Number of frame alignment errors that happened per second on received
                     packets.

              rxfifo/s
                     Number of FIFO overrun errors that happened per  second  on  received
                     packets.

              txfifo/s
                     Number of FIFO overrun errors that happened per second on transmitted
                     packets.

              With the NFS keyword, statistics about NFS  client  activity  are  reported.
              The following values are displayed:

              call/s
                     Number of RPC requests made per second.

              retrans/s
                     Number  of RPC requests per second, those which needed to be retrans-
                     mitted (for example because of a server timeout).

              read/s
                     Number of 'read' RPC calls made per second.

              write/s
                     Number of 'write' RPC calls made per second.

              access/s
                     Number of 'access' RPC calls made per second.

              getatt/s
                     Number of 'getattr' RPC calls made per second.

              With the NFSD keyword, statistics about NFS server  activity  are  reported.
              The following values are displayed:

              scall/s
                     Number of RPC requests received per second.

              badcall/s
                     Number  of bad RPC requests received per second, those whose process-
                     ing generated an error.

              packet/s
                     Number of network packets received per second.

              udp/s
                     Number of UDP packets received per second.

              tcp/s
                     Number of TCP packets received per second.

              hit/s
                     Number of reply cache hits per second.

              miss/s
                     Number of reply cache misses per second.

              sread/s
                     Number of 'read' RPC calls received per second.

              swrite/s
                     Number of 'write' RPC calls received per second.

              saccess/s
                     Number of 'access' RPC calls received per second.

              sgetatt/s
                     Number of 'getattr' RPC calls received per second.

              With the SOCK keyword, statistics on sockets in  use  are  reported  (IPv4).
              The following values are displayed:

              totsck
                     Total number of sockets used by the system.

              tcpsck
                     Number of TCP sockets currently in use.

              udpsck
                     Number of UDP sockets currently in use.

              rawsck
                     Number of RAW sockets currently in use.

              ip-frag
                     Number of IP fragments currently in use.

              tcp-tw
                     Number of TCP sockets in TIME_WAIT state.

              With  the  IP  keyword,  statistics about IPv4 network traffic are reported.
              Note that IPv4 statistics depend on sadc option "-S SNMP" to  be  collected.
              The  following values are displayed (formal SNMP names between square brack-
              ets):

              irec/s
                     The total number of input datagrams received from interfaces per sec-
                     ond, including those received in error [ipInReceives].

              fwddgm/s
                     The  number  of input datagrams per second, for which this entity was
                     not their final IP destination, as a result of which an  attempt  was
                     made  to  find  a  route  to  forward  them to that final destination
                     [ipForwDatagrams].

              idel/s
                     The total number of input datagrams successfully delivered per second
                     to IP user-protocols (including ICMP) [ipInDelivers].

              orq/s
                     The  total  number  of  IP  datagrams  which  local IP user-protocols
                     (including ICMP) supplied per second to IP in requests for  transmis-
                     sion  [ipOutRequests].   Note  that this counter does not include any
                     datagrams counted in fwddgm/s.

              asmrq/s
                     The number of IP fragments received per second  which  needed  to  be
                     reassembled at this entity [ipReasmReqds].

              asmok/s
                     The  number  of  IP  datagrams  successfully  re-assembled per second
                     [ipReasmOKs].

              fragok/s
                     The number of IP datagrams that have been successfully fragmented  at
                     this entity per second [ipFragOKs].

              fragcrt/s
                     The number of IP datagram fragments that have been generated per sec-
                     ond as a result of fragmentation at this entity [ipFragCreates].

              With the EIP keyword, statistics about IPv4  network  errors  are  reported.
              Note  that  IPv4 statistics depend on sadc option "-S SNMP" to be collected.
              The following values are displayed (formal SNMP names between square  brack-
              ets):

              ihdrerr/s
                     The  number  of input datagrams discarded per second due to errors in
                     their IP headers, including bad checksums, version  number  mismatch,
                     other format errors, time-to-live exceeded, errors discovered in pro-
                     cessing their IP options, etc. [ipInHdrErrors]

              iadrerr/s
                     The number of input datagrams discarded per  second  because  the  IP
                     address  in  their  IP  header's  destination  field  was not a valid
                     address to be received at this entity. This  count  includes  invalid
                     addresses (e.g., 0.0.0.0) and addresses of unsupported Classes (e.g.,
                     Class E). For entities which are not IP routers and therefore do  not
                     forward  datagrams, this counter includes datagrams discarded because
                     the destination address was not a local address [ipInAddrErrors].

              iukwnpr/s
                     The number of locally-addressed datagrams received  successfully  but
                     discarded  per  second  because of an unknown or unsupported protocol
                     [ipInUnknownProtos].

              idisc/s
                     The number of input IP datagrams per second  for  which  no  problems
                     were  encountered  to  prevent  their continued processing, but which
                     were discarded (e.g., for lack of buffer space) [ipInDiscards].  Note
                     that  this  counter  does  not  include any datagrams discarded while
                     awaiting re-assembly.

              odisc/s
                     The number of output IP datagrams per second for which no problem was
                     encountered  to  prevent their transmission to their destination, but
                     which were discarded (e.g., for  lack  of  buffer  space)  [ipOutDis-
                     cards].   Note  that  this counter would include datagrams counted in
                     fwddgm/s if any such packets met this (discretionary) discard  crite-
                     rion.

              onort/s
                     The  number  of  IP  datagrams  discarded per second because no route
                     could be found to transmit them to their destination [ipOutNoRoutes].
                     Note that this counter includes any packets counted in fwddgm/s which
                     meet this 'no-route' criterion.  Note that this  includes  any  data-
                     grams  which  a  host cannot route because all of its default routers
                     are down.

              asmf/s
                     The number of failures detected per  second  by  the  IP  re-assembly
                     algorithm  (for  whatever  reason:  timed out, errors, etc) [ipReasm-
                     Fails].  Note that this is not necessarily a count  of  discarded  IP
                     fragments since some algorithms can lose track of the number of frag-
                     ments by combining them as they are received.

              fragf/s
                     The number of IP  datagrams  that  have  been  discarded  per  second
                     because they needed to be fragmented at this entity but could not be,
                     e.g., because their Don't Fragment flag was set [ipFragFails].

              With the ICMP keyword, statistics about ICMPv4 network traffic are reported.
              Note that ICMPv4 statistics depend on sadc option "-S SNMP" to be collected.
              The following values are displayed (formal SNMP names between square  brack-
              ets):

              imsg/s
                     The  total number of ICMP messages which the entity received per sec-
                     ond [icmpInMsgs].  Note that this counter includes all those  counted
                     by ierr/s.

              omsg/s
                     The total number of ICMP messages which this entity attempted to send
                     per second [icmpOutMsgs].  Note that this counter includes all  those
                     counted by oerr/s.

              iech/s
                     The  number  of  ICMP  Echo  (request)  messages  received per second
                     [icmpInEchos].

              iechr/s
                     The number of ICMP Echo Reply messages received per second  [icmpInE-
                     choReps].

              oech/s
                     The number of ICMP Echo (request) messages sent per second [icmpOutE-
                     chos].

              oechr/s
                     The number of ICMP Echo Reply messages  sent  per  second  [icmpOutE-
                     choReps].

              itm/s
                     The  number  of ICMP Timestamp (request) messages received per second
                     [icmpInTimestamps].

              itmr/s
                     The number of ICMP  Timestamp  Reply  messages  received  per  second
                     [icmpInTimestampReps].

              otm/s
                     The number of ICMP Timestamp (request) messages sent per second [icm-
                     pOutTimestamps].

              otmr/s
                     The number of ICMP Timestamp Reply messages sent per second [icmpOut-
                     TimestampReps].

              iadrmk/s
                     The  number of ICMP Address Mask Request messages received per second
                     [icmpInAddrMasks].

              iadrmkr/s
                     The number of ICMP Address Mask Reply messages  received  per  second
                     [icmpInAddrMaskReps].

              oadrmk/s
                     The  number  of  ICMP  Address  Mask Request messages sent per second
                     [icmpOutAddrMasks].

              oadrmkr/s
                     The number of ICMP Address Mask Reply messages sent per second  [icm-
                     pOutAddrMaskReps].

              With the EICMP keyword, statistics about ICMPv4 error messages are reported.
              Note that ICMPv4 statistics depend on sadc option "-S SNMP" to be collected.
              The  following values are displayed (formal SNMP names between square brack-
              ets):

              ierr/s
                     The number of ICMP messages per second which the entity received  but
                     determined  as  having  ICMP-specific errors (bad ICMP checksums, bad
                     length, etc.) [icmpInErrors].

              oerr/s
                     The number of ICMP messages per second which this entity did not send
                     due  to  problems  discovered  within  ICMP such as a lack of buffers
                     [icmpOutErrors].

              idstunr/s
                     The number of ICMP Destination Unreachable messages received per sec-
                     ond [icmpInDestUnreachs].

              odstunr/s
                     The  number  of ICMP Destination Unreachable messages sent per second
                     [icmpOutDestUnreachs].

              itmex/s
                     The number of ICMP Time Exceeded messages received per second  [icmp-
                     InTimeExcds].

              otmex/s
                     The  number  of ICMP Time Exceeded messages sent per second [icmpOut-
                     TimeExcds].

              iparmpb/s
                     The number of ICMP Parameter Problem  messages  received  per  second
                     [icmpInParmProbs].

              oparmpb/s
                     The  number  of ICMP Parameter Problem messages sent per second [icm-
                     pOutParmProbs].

              isrcq/s
                     The number  of  ICMP  Source  Quench  messages  received  per  second
                     [icmpInSrcQuenchs].

              osrcq/s
                     The number of ICMP Source Quench messages sent per second [icmpOutSr-
                     cQuenchs].

              iredir/s
                     The number of ICMP Redirect messages received per second [icmpInRedi-
                     rects].

              oredir/s
                     The  number  of  ICMP Redirect messages sent per second [icmpOutRedi-
                     rects].

              With the TCP keyword, statistics about TCPv4 network traffic  are  reported.
              Note  that TCPv4 statistics depend on sadc option "-S SNMP" to be collected.
              The following values are displayed (formal SNMP names between square  brack-
              ets):

              active/s
                     The  number of times TCP connections have made a direct transition to
                     the SYN-SENT state from the CLOSED state per second [tcpActiveOpens].

              passive/s
                     The  number of times TCP connections have made a direct transition to
                     the  SYN-RCVD  state  from  the  LISTEN  state  per  second  [tcpPas-
                     siveOpens].

              iseg/s
                     The  total  number  of  segments received per second, including those
                     received in error [tcpInSegs].  This count includes segments received
                     on currently established connections.

              oseg/s
                     The total number of segments sent per second, including those on cur-
                     rent connections but excluding those  containing  only  retransmitted
                     octets [tcpOutSegs].

              With  the  ETCP keyword, statistics about TCPv4 network errors are reported.
              Note that TCPv4 statistics depend on sadc option "-S SNMP" to be  collected.
              The  following values are displayed (formal SNMP names between square brack-
              ets):

              atmptf/s
                     The number of times per second TCP connections  have  made  a  direct
                     transition  to the CLOSED state from either the SYN-SENT state or the
                     SYN-RCVD state, plus the number of times per second  TCP  connections
                     have  made  a direct transition to the LISTEN state from the SYN-RCVD
                     state [tcpAttemptFails].

              estres/s
                     The number of times per second TCP connections  have  made  a  direct
                     transition  to  the CLOSED state from either the ESTABLISHED state or
                     the CLOSE-WAIT state [tcpEstabResets].

              retrans/s
                     The total number of segments retransmitted per second - that is,  the
                     number  of TCP segments transmitted containing one or more previously
                     transmitted octets [tcpRetransSegs].

              isegerr/s
                     The total number of segments received in error (e.g., bad TCP  check-
                     sums) per second [tcpInErrs].

              orsts/s
                     The  number  of  TCP segments sent per second containing the RST flag
                     [tcpOutRsts].

              With the UDP keyword, statistics about UDPv4 network traffic  are  reported.
              Note  that UDPv4 statistics depend on sadc option "-S SNMP" to be collected.
              The following values are displayed (formal SNMP names between square  brack-
              ets):

              idgm/s
                     The  total  number of UDP datagrams delivered per second to UDP users
                     [udpInDatagrams].

              odgm/s
                     The total number of UDP datagrams sent per second  from  this  entity
                     [udpOutDatagrams].

              noport/s
                     The total number of received UDP datagrams per second for which there
                     was no application at the destination port [udpNoPorts].

              idgmerr/s
                     The number of received UDP datagrams per second  that  could  not  be
                     delivered  for  reasons  other than the lack of an application at the
                     destination port [udpInErrors].

              With the SOCK6 keyword, statistics on sockets in use  are  reported  (IPv6).
              Note  that  IPv6 statistics depend on sadc option "-S IPV6" to be collected.
              The following values are displayed:

              tcp6sck
                     Number of TCPv6 sockets currently in use.

              udp6sck
                     Number of UDPv6 sockets currently in use.

              raw6sck
                     Number of RAWv6 sockets currently in use.

              ip6-frag
                     Number of IPv6 fragments currently in use.

              With the IP6 keyword, statistics about IPv6 network  traffic  are  reported.
              Note  that  IPv6 statistics depend on sadc option "-S IPV6" to be collected.
              The following values are displayed (formal SNMP names between square  brack-
              ets):

              irec6/s
                     The total number of input datagrams received from interfaces per sec-
                     ond, including those received in error [ipv6IfStatsInReceives].

              fwddgm6/s
                     The number of output datagrams per second which this entity  received
                     and  forwarded  to  their final destinations [ipv6IfStatsOutForwData-
                     grams].

              idel6/s
                     The total number of datagrams successfully delivered  per  second  to
                     IPv6 user-protocols (including ICMP) [ipv6IfStatsInDelivers].

              orq6/s
                     The  total  number  of IPv6 datagrams which local IPv6 user-protocols
                     (including ICMP) supplied per second to IPv6 in requests  for  trans-
                     mission  [ipv6IfStatsOutRequests].   Note  that this counter does not
                     include any datagrams counted in fwddgm6/s.

              asmrq6/s
                     The number of IPv6 fragments received per second which needed  to  be
                     reassembled at this interface [ipv6IfStatsReasmReqds].

              asmok6/s
                     The  number  of  IPv6  datagrams  successfully reassembled per second
                     [ipv6IfStatsReasmOKs].

              imcpck6/s
                     The number of multicast packets received per second by the  interface
                     [ipv6IfStatsInMcastPkts].

              omcpck6/s
                     The  number of multicast packets transmitted per second by the inter-
                     face [ipv6IfStatsOutMcastPkts].

              fragok6/s
                     The number of IPv6 datagrams that have been  successfully  fragmented
                     at this output interface per second [ipv6IfStatsOutFragOKs].

              fragcr6/s
                     The  number of output datagram fragments that have been generated per
                     second  as  a  result  of  fragmentation  at  this  output  interface
                     [ipv6IfStatsOutFragCreates].

              With  the  EIP6  keyword, statistics about IPv6 network errors are reported.
              Note that IPv6 statistics depend on sadc option "-S IPV6" to  be  collected.
              The  following values are displayed (formal SNMP names between square brack-
              ets):

              ihdrer6/s
                     The number of input datagrams discarded per second due to  errors  in
                     their  IPv6  headers, including version number mismatch, other format
                     errors, hop count exceeded, errors  discovered  in  processing  their
                     IPv6 options, etc. [ipv6IfStatsInHdrErrors]

              iadrer6/s
                     The  number  of input datagrams discarded per second because the IPv6
                     address in their IPv6 header's destination  field  was  not  a  valid
                     address  to  be  received at this entity. This count includes invalid
                     addresses (e.g., ::0) and unsupported addresses (e.g., addresses with
                     unallocated  prefixes).  For  entities which are not IPv6 routers and
                     therefore do not forward datagrams, this counter  includes  datagrams
                     discarded  because  the  destination  address was not a local address
                     [ipv6IfStatsInAddrErrors].

              iukwnp6/s
                     The number of locally-addressed datagrams received  successfully  but
                     discarded  per  second  because of an unknown or unsupported protocol
                     [ipv6IfStatsInUnknownProtos].

              i2big6/s
                     The number of input datagrams that could not be forwarded per  second
                     because  their  size  exceeded  the  link  MTU  of outgoing interface
                     [ipv6IfStatsInTooBigErrors].

              idisc6/s
                     The number of input IPv6 datagrams per second for which  no  problems
                     were  encountered  to  prevent  their continued processing, but which
                     were discarded (e.g., for lack of  buffer  space)  [ipv6IfStatsInDis-
                     cards].  Note  that  this counter does not include any datagrams dis-
                     carded while awaiting re-assembly.

              odisc6/s
                     The number of output IPv6 datagrams per second for which  no  problem
                     was  encountered  to prevent their transmission to their destination,
                     but which were discarded (e.g., for lack of buffer  space)  [ipv6IfS-
                     tatsOutDiscards].  Note  that  this  counter  would include datagrams
                     counted in fwddgm6/s if any such  packets  met  this  (discretionary)
                     discard criterion.

              inort6/s
                     The  number  of input datagrams discarded per second because no route
                     could be found to transmit them to their destination  [ipv6IfStatsIn-
                     NoRoutes].

              onort6/s
                     The  number  of  locally  generated IP datagrams discarded per second
                     because no route could be found to transmit them to their destination
                     [unknown formal SNMP name].

              asmf6/s
                     The  number  of  failures detected per second by the IPv6 re-assembly
                     algorithm (for whatever reason: timed out, errors, etc.) [ipv6IfStat-
                     sReasmFails].  Note that this is not necessarily a count of discarded
                     IPv6 fragments since some algorithms can lose track of the number  of
                     fragments by combining them as they are received.

              fragf6/s
                     The  number  of  IPv6  datagrams  that have been discarded per second
                     because they needed to be fragmented at  this  output  interface  but
                     could not be [ipv6IfStatsOutFragFails].

              itrpck6/s
                     The  number  of input datagrams discarded per second because datagram
                     frame didn't carry enough data [ipv6IfStatsInTruncatedPkts].

              With  the  ICMP6  keyword,  statistics  about  ICMPv6  network  traffic  are
              reported.  Note that ICMPv6 statistics depend on sadc option "-S IPV6" to be
              collected.  The following values are displayed (formal  SNMP  names  between
              square brackets):

              imsg6/s
                     The  total number of ICMP messages received by the interface per sec-
                     ond which includes all those counted by ierr6/s [ipv6IfIcmpInMsgs].

              omsg6/s
                     The total number of ICMP messages which this interface  attempted  to
                     send per second [ipv6IfIcmpOutMsgs].

              iech6/s
                     The  number of ICMP Echo (request) messages received by the interface
                     per second [ipv6IfIcmpInEchos].

              iechr6/s
                     The number of ICMP Echo Reply messages received by the interface  per
                     second [ipv6IfIcmpInEchoReplies].

              oechr6/s
                     The number of ICMP Echo Reply messages sent by the interface per sec-
                     ond [ipv6IfIcmpOutEchoReplies].

              igmbq6/s
                     The number of ICMPv6 Group Membership Query messages received by  the
                     interface per second [ipv6IfIcmpInGroupMembQueries].

              igmbr6/s
                     The  number  of ICMPv6 Group Membership Response messages received by
                     the interface per second [ipv6IfIcmpInGroupMembResponses].

              ogmbr6/s
                     The number of ICMPv6 Group Membership Response messages sent per sec-
                     ond [ipv6IfIcmpOutGroupMembResponses].

              igmbrd6/s
                     The  number of ICMPv6 Group Membership Reduction messages received by
                     the interface per second [ipv6IfIcmpInGroupMembReductions].

              ogmbrd6/s
                     The number of ICMPv6 Group Membership  Reduction  messages  sent  per
                     second [ipv6IfIcmpOutGroupMembReductions].

              irtsol6/s
                     The  number of ICMP Router Solicit messages received by the interface
                     per second [ipv6IfIcmpInRouterSolicits].

              ortsol6/s
                     The number of ICMP Router Solicitation messages sent by the interface
                     per second [ipv6IfIcmpOutRouterSolicits].

              irtad6/s
                     The  number  of  ICMP  Router  Advertisement messages received by the
                     interface per second [ipv6IfIcmpInRouterAdvertisements].

              inbsol6/s
                     The number of ICMP Neighbor Solicit messages received by  the  inter-
                     face per second [ipv6IfIcmpInNeighborSolicits].

              onbsol6/s
                     The  number of ICMP Neighbor Solicitation messages sent by the inter-
                     face per second [ipv6IfIcmpOutNeighborSolicits].

              inbad6/s
                     The number of ICMP Neighbor Advertisement messages  received  by  the
                     interface per second [ipv6IfIcmpInNeighborAdvertisements].

              onbad6/s
                     The number of ICMP Neighbor Advertisement messages sent by the inter-
                     face per second [ipv6IfIcmpOutNeighborAdvertisements].

              With  the  EICMP6  keyword,  statistics  about  ICMPv6  error  messages  are
              reported.  Note that ICMPv6 statistics depend on sadc option "-S IPV6" to be
              collected.  The following values are displayed (formal  SNMP  names  between
              square brackets):

              ierr6/s
                     The  number  of ICMP messages per second which the interface received
                     but determined as having ICMP-specific errors  (bad  ICMP  checksums,
                     bad length, etc.)  [ipv6IfIcmpInErrors]

              idtunr6/s
                     The  number  of ICMP Destination Unreachable messages received by the
                     interface per second [ipv6IfIcmpInDestUnreachs].

              odtunr6/s
                     The number of ICMP  Destination  Unreachable  messages  sent  by  the
                     interface per second [ipv6IfIcmpOutDestUnreachs].

              itmex6/s
                     The  number  of ICMP Time Exceeded messages received by the interface
                     per second [ipv6IfIcmpInTimeExcds].

              otmex6/s
                     The number of ICMP Time Exceeded messages sent by the  interface  per
                     second [ipv6IfIcmpOutTimeExcds].

              iprmpb6/s
                     The  number of ICMP Parameter Problem messages received by the inter-
                     face per second [ipv6IfIcmpInParmProblems].

              oprmpb6/s
                     The number of ICMP Parameter Problem messages sent by  the  interface
                     per second [ipv6IfIcmpOutParmProblems].

              iredir6/s
                     The  number of Redirect messages received by the interface per second
                     [ipv6IfIcmpInRedirects].

              oredir6/s
                     The number of Redirect messages  sent  by  the  interface  by  second
                     [ipv6IfIcmpOutRedirects].

              ipck2b6/s
                     The  number of ICMP Packet Too Big messages received by the interface
                     per second [ipv6IfIcmpInPktTooBigs].

              opck2b6/s
                     The number of ICMP Packet Too Big messages sent by the interface  per
                     second [ipv6IfIcmpOutPktTooBigs].

              With  the UDP6 keyword, statistics about UDPv6 network traffic are reported.
              Note that UDPv6 statistics depend on sadc option "-S IPV6" to be  collected.
              The  following  values  are  displayed  (formal  SNMP  names  between square
              brackets):

              idgm6/s
                     The total number of UDP datagrams delivered per second to  UDP  users
                     [udpInDatagrams].

              odgm6/s
                     The  total  number  of UDP datagrams sent per second from this entity
                     [udpOutDatagrams].

              noport6/s
                     The total number of received UDP datagrams per second for which there
                     was no application at the destination port [udpNoPorts].

              idgmer6/s
                     The  number  of  received  UDP datagrams per second that could not be
                     delivered for reasons other than the lack of an  application  at  the
                     destination port [udpInErrors].

              The  ALL  keyword  is  equivalent  to  specifying all the keywords above and
              therefore all the network activities are reported.

       -o [ filename ]
              Save the readings in the file in binary form. Each reading is in a  separate
              record.  The  default  value  of the filename parameter is the current daily
              data file, the /var/log/sa/sadd file. The -o option is exclusive of  the  -f
              option.   All  the  data available from the kernel are saved in the file (in
              fact, sar calls its data collector  sadc  with  the  option  "-S  ALL".  See
              sadc(8) manual page).

       -P { cpu [,...] | ALL }
              Report  per-processor  statistics for the specified processor or processors.
              Specifying the ALL keyword reports statistics for each individual processor,
              and globally for all processors.  Note that processor 0 is the first proces-
              sor.

       -p     Pretty-print device names. Use this option in conjunction  with  option  -d.
              By  default  names  are  printed  as dev m-n where m and n are the major and
              minor numbers for the device.  Use of this option displays the names of  the
              devices  as  they  (should)  appear in /dev. Name mappings are controlled by
              /etc/sysconfig/sysstat.ioconf.

       -q     Report queue length and load averages. The following values are displayed:

              runq-sz
                     Run queue length (number of tasks waiting for run time).

              plist-sz
                     Number of tasks in the task list.

              ldavg-1
                     System load average for the last minute.  The load average is  calcu-
                     lated  as  the average number of runnable or running tasks (R state),
                     and the number of tasks in uninterruptible sleep (D state)  over  the
                     specified interval.

              ldavg-5
                     System load average for the past 5 minutes.

              ldavg-15
                     System load average for the past 15 minutes.

       -r     Report memory utilization statistics.  The following values are displayed:

              kbmemfree
                     Amount of free memory available in kilobytes.

              kbmemused
                     Amount  of  used memory in kilobytes. This does not take into account
                     memory used by the kernel itself.

              %memused
                     Percentage of used memory.

              kbbuffers
                     Amount of memory used as buffers by the kernel in kilobytes.

              kbcached
                     Amount of memory used to cache data by the kernel in kilobytes.

              kbcommit
                     Amount of memory in kilobytes needed for current workload. This is an
                     estimate of how much RAM/swap is needed to guarantee that there never
                     is out of memory.

              %commit
                     Percentage of memory needed for current workload in relation  to  the
                     total  amount  of memory (RAM+swap).  This number may be greater than
                     100% because the kernel usually overcommits memory.


       -R     Report memory statistics. The following values are displayed:

              frmpg/s
                     Number of memory pages freed by the system per  second.   A  negative
                     value  represents  a  number  of pages allocated by the system.  Note
                     that a page has a size of 4 kB or  8  kB  according  to  the  machine
                     architecture.

              bufpg/s
                     Number  of  additional memory pages used as buffers by the system per
                     second.  A negative value means fewer pages used as  buffers  by  the
                     system.

              campg/s
                     Number of additional memory pages cached by the system per second.  A
                     negative value means fewer pages in the cache.

       -s [ hh:mm:ss ]
              Set the starting time of the  data,  causing  the  sar  command  to  extract
              records time-tagged at, or following, the time specified. The default start-
              ing time is 08:00:00.  Hours must be given in 24-hour  format.  This  option
              can be used only when data are read from a file (option -f ).

       -S     Report  swap  space  utilization  statistics.  The following values are dis-
              played:

              kbswpfree
                     Amount of free swap space in kilobytes.

              kbswpused
                     Amount of used swap space in kilobytes.

              %swpused
                     Percentage of used swap space.

              kbswpcad
                     Amount of cached swap memory in kilobytes.  This is memory that  once
                     was  swapped  out,  is  swapped back in but still also is in the swap
                     area (if memory is needed it doesn't need to  be  swapped  out  again
                     because it is already in the swap area. This saves I/O).

              %swpcad
                     Percentage  of  cached  swap memory in relation to the amount of used
                     swap space.

       -t     When reading data from a daily data file, indicate that sar  should  display
              the timestamps in the original locale time of the data file creator. Without
              this option, the sar command displays the timestamps in  the  user's  locale
              time.

       -u [ ALL ]
              Report  CPU  utilization.  The ALL keyword indicates that all the CPU fields
              should be displayed.  The report may show the following fields:

              %user
                     Percentage of CPU utilization that occurred while  executing  at  the
                     user  level  (application).  Note that this field includes time spent
                     running virtual processors.

              %usr
                     Percentage of CPU utilization that occurred while  executing  at  the
                     user  level (application). Note that this field does NOT include time
                     spent running virtual processors.

              %nice
                     Percentage of CPU utilization that occurred while  executing  at  the
                     user level with nice priority.

              %system
                     Percentage  of  CPU  utilization that occurred while executing at the
                     system level (kernel). Note that this field includes time spent  ser-
                     vicing hardware and software interrupts.

              %sys
                     Percentage  of  CPU  utilization that occurred while executing at the
                     system level (kernel). Note that this field  does  NOT  include  time
                     spent servicing hardware or software interrupts.

              %iowait
                     Percentage  of  time  that the CPU or CPUs were idle during which the
                     system had an outstanding disk I/O request.

              %steal
                     Percentage of time spent in involuntary wait by the  virtual  CPU  or
                     CPUs while the hypervisor was servicing another virtual processor.

              %irq
                     Percentage  of  time  spent  by  the  CPU or CPUs to service hardware
                     interrupts.

              %soft
                     Percentage of time spent by the  CPU  or  CPUs  to  service  software
                     interrupts.

              %guest
                     Percentage  of time spent by the CPU or CPUs to run a virtual proces-
                     sor.

              %idle
                     Percentage of time that the CPU or CPUs were idle and the system  did
                     not have an outstanding disk I/O request.

              Note:  On  SMP  machines  a processor that does not have any activity at all
              (0.00 for every field) is a disabled (offline) processor.

       -v     Report status of inode, file and other kernel tables.  The following  values
              are displayed:

              dentunusd
                     Number of unused cache entries in the directory cache.

              file-nr
                     Number of file handles used by the system.

              inode-nr
                     Number of inode handlers used by the system.

              pty-nr
                     Number of pseudo-terminals used by the system.

       -V     Print version number then exit.

       -w     Report task creation and system switching activity.

              proc/s
                     Total number of tasks created per second.

              cswch/s
                     Total number of context switches per second.

       -W     Report swapping statistics. The following values are displayed:

              pswpin/s
                     Total number of swap pages the system brought in per second.

              pswpout/s
                     Total number of swap pages the system brought out per second.

       -y     Report TTY device activity. The following values are displayed:

              rcvin/s
                     Number  of  receive  interrupts  per  second for current serial line.
                     Serial line number is given in the TTY column.

              xmtin/s
                     Number of transmit interrupts per second for current serial line.

              framerr/s
                     Number of frame errors per second for current serial line.

              prtyerr/s
                     Number of parity errors per second for current serial line.

              brk/s
                     Number of breaks per second for current serial line.

              ovrun/s
                     Number of overrun errors per second for current serial line.

              Note that with recent 2.6 kernels, these statistics can be retrieved only by
              root.


ENVIRONMENT
       The sar command takes into account the following environment variables:


       S_TIME_FORMAT
              If this variable exists and its value is ISO then the current locale will be
              ignored when printing the date in the report header.  The sar  command  will
              use the ISO 8601 format (YYYY-MM-DD) instead.


       S_TIME_DEF_TIME
              If  this variable exists and its value is UTC then sar will save its data in
              UTC time (data will still be displayed in local time).  sar  will  also  use
              UTC  time  instead  of  local  time to determine the current daily data file
              located in the /var/log/sa  directory.  This  variable  may  be  useful  for
              servers with users located across several timezones.

EXAMPLES
       sar -u 2 5
              Report CPU utilization for each 2 seconds. 5 lines are displayed.

       sar -I 14 -o int14.file 2 10
              Report  statistics  on  IRQ  14  for each 2 seconds. 10 lines are displayed.
              Data are stored in a file called int14.file.

       sar -r -n DEV -f /var/log/sa/sa16
              Display memory and network statistics saved in daily data file 'sa16'.

       sar -A
              Display all the statistics saved in current daily data file.

BUGS
       /proc filesystem must be mounted for the sar command to work.

       All the statistics are not necessarily available, depending on the  kernel  version
       used.

FILES
       /var/log/sa/sadd
              Indicate  the daily data file, where the dd parameter is a number represent-
              ing the day of the month.

       /proc contains various files with system statistics.

AUTHOR
       Sebastien Godard (sysstat <at> orange.fr)

SEE ALSO
       sadc(8),  sa1(8),  sa2(8),  sadf(1),  isag(1),  pidstat(1),  mpstat(1),  iostat(1),
       vmstat(8)

       http://pagesperso-orange.fr/sebastien.godard/



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