sar


SYNOPSIS
       sar [ -A ] [ -B ] [ -b ] [ -C ] [ -d ] [ -F ] [ -H ] [ -h ] [ -p ] [ -q
       ] [ -R ] [ -r ] [ -S ] [ -t ] [ -u [ ALL ] ] [ -V ] [ -v ] [ -W ] [  -w
       ]  [  -y ] [ -I { int [,...] | SUM | ALL | XALL } ] [ -P { cpu [,...] |
       ALL } ] [ -m { keyword [,...] | ALL } ] [ -n { keyword [,...] | ALL } ]
       [  -j  {  ID  |  LABEL | PATH | UUID | ... } ] [ -f [ filename ] | -o [
       filename ] | -[0-9]+ ] [ -i interval ] [ -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  values  in  the count and interval parameters,
       writes information the specified number of times spaced at  the  speci-
       fied  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  col-
       lected  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/sysstat/sadd file, where the dd parameter indicates  the  cur-
       rent  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  previ-
       ously 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.
       It  is also possible to enter -1, -2 etc. as an argument to sar to dis-
       play data of that days ago. For example, -1 will point at the  standard
       system activity file of yesterday.

       Without  the -P flag, the sar command reports system-wide (global among
       all processors) statistics, which are calculated as averages for values
       expressed  as  percentages,  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 specifying any flags selects only CPU activity.   Specifying
       the -A flag selects all possible activities.

       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 uti-
       lization is near 100 percent (user + nice + system), the workload  sam-
       pled 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:


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

       -B     Report paging statistics.  The following values are displayed:

              pgpgin/s
                     Total number of kilobytes the system paged in  from  disk
                     per second.

              pgpgout/s
                     Total  number  of  kilobytes the system paged out to disk
                     per second.

              fault/s
                     Number of page faults (major + minor) made by the  system
                     per second.  This is not a count of page faults that gen-
                     erate I/O, because some page faults can be resolved with-
                     out 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 mem-
                     ory 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  difficulty.
                     This  field  is  displayed  as zero if no pages have been
                     scanned during the interval of time.

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

                     Total number of write requests per second issued to phys-
                     ical devices.

              bread/s
                     Total  amount of data read from the devices in blocks per
                     second.  Blocks are equivalent to sectors  and  therefore
                     have a size of 512 bytes.

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

       -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.  When data are displayed,
              the device specification dev m-n is generally used  (  DEV  col-
              umn).   m is the major number of the device and n its minor num-
              ber.  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).  Note  that  disk  activity  depends  on  sadc
              options -S DISK and -S XDISK to be collected. The following val-
              ues 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 servic-
                     ing them.

              svctm
                     The  average  service  time  (in  milliseconds)  for  I/O

              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     Display    statistics   for   currently   mounted   filesystems.
              Pseudo-filesystems are ignored. At the end of  the  report,  sar
              will  display  a  summary  of  all those filesystems.  Note that
              filesystems statistics depend on sadc option -S XDISK to be col-
              lected.  The following values are displayed:

              MBfsfree
                     Total  amount  a free space in megabytes (including space
                     available only to privileged user).

              MBfsused
                     Total amount of space used in megabytes.

              %fsused
                     Percentage of filesystem space used, as seen by a  privi-
                     leged user.

              %ufsused
                     Percentage  of  filesystem  space  used,  as  seen  by an
                     unprivileged user.

              Ifree
                     Total number of free file nodes in filesystem.

              Iused
                     Total number of file nodes used in filesystem.

              %Iused
                     Percentage of file nodes used in filesystem.

       -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/sysstat/sadd  file.  The  -f  option  is
              exclusive of the -o option.

       -H     Report  hugepages  utilization statistics.  The following values
              are displayed:

              kbhugfree
                     Amount of hugepages memory in kilobytes that is  not  yet
                     allocated.

              kbhugused
                     Amount  of  hugepages  memory  in kilobytes that has been
                     allocated.

              %hugused
                     Percentage of total hugepages memory that has been  allo-
                     cated.

              Note  that  interrupt statistics depend on sadc option -S INT to
              be collected.

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

       -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 prerequi-
              site 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).

       -m { keyword [,...] | ALL }
              Report power management statistics.  Note that these  statistics
              depend on sadc option -S POWER to be collected.

              Possible keywords are CPU, FAN, FREQ, IN, TEMP and USB.

              With  the  CPU  keyword, statistics about CPU are reported.  The
              following value is displayed:

              MHz
                     Instantaneous CPU clock frequency in MHz.

              With the FAN keyword, statistics about fans speed are  reported.
              The following values are displayed:

              rpm
                     Fan speed expressed in revolutions per minute.

              drpm
                     This  field  is calculated as the difference between cur-
                     rent fan speed (rpm) and its low limit (fan_min).

              DEVICE
                     Sensor device name.

              With the FREQ keyword, statistics about CPU clock frequency  are
              reported.  The following value is displayed:

              wghMHz
                     Weighted  average  CPU clock frequency in MHz.  Note that
                     the cpufreq-stats driver must be compiled in  the  kernel
                     for this option to work.

              With  the  IN  keyword,  statistics  about  voltage  inputs  are
              reported.  The following values are displayed:

              inV
                     Voltage input expressed in Volts.

                     Device temperature expressed in degrees Celsius.

              %temp
                     Relative  device  temperature. A value of 100% means that
                     temperature has reached its high limit (temp_max).

              DEVICE
                     Sensor device name.

              With the USB keyword, the sar command takes a  snapshot  of  all
              the USB devices currently plugged into the system. At the end of
              the report, sar will display a summary of all those USB devices.
              The following values are displayed:

              BUS
                     Root hub number of the USB device.

              idvendor
                     Vendor ID number (assigned by USB organization).

              idprod
                     Product ID number (assigned by Manufacturer).

              maxpower
                     Maximum  power  consumption  of  the device (expressed in
                     mA).

              manufact
                     Manufacturer name.

              product
                     Product name.

       -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.
                     Number of multicast packets received per second.

              %ifutil
                     Utilization percentage  of  the  network  interface.  For
                     half-duplex  interfaces,  utilization is calculated using
                     the sum of rxkB/s and  txkB/s  as  a  percentage  of  the
                     interface  speed. For full-duplex, this is the greater of
                     rxkB/S or txkB/s.

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

              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:
              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 processing 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.

              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 (for-
              mal SNMP names between square brackets):

              irec/s
                     The total number of input datagrams received from  inter-
                     faces  per  second,  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 deliv-
                     ered per second to  IP  user-protocols  (including  ICMP)
                     [ipInDelivers].

              orq/s
                     The total number of IP datagrams which local IP user-pro-
                     tocols (including ICMP) supplied  per  second  to  IP  in
                     requests  for  transmission  [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 gener-
                     ated  per  second  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  (for-
              mal SNMP names between square brackets):

              ihdrerr/s
                     The number of input datagrams discarded per second due to
                     errors in their IP headers, including bad checksums, ver-
                     datagrams discarded because the destination  address  was
                     not a local address [ipInAddrErrors].

              iukwnpr/s
                     The  number  of locally-addressed datagrams received suc-
                     cessfully 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 pro-
                     cessing, but which were discarded (e.g., for lack of buf-
                     fer 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) [ipOutDiscards].  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 desti-
                     nation [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) [ipReasmFails].  Note that this is not  nec-
                     essarily  a  count  of  discarded IP fragments since some
                     algorithms can lose track of the number of  fragments  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 Frag-
                     ment 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 brackets):

              imsg/s

              iechr/s
                     The number of ICMP Echo Reply messages received per  sec-
                     ond [icmpInEchoReps].

              oech/s
                     The  number of ICMP Echo (request) messages sent per sec-
                     ond [icmpOutEchos].

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

              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 [icmpOutTimestamps].

              otmr/s
                     The number of ICMP Timestamp Reply messages sent per sec-
                     ond [icmpOutTimestampReps].

              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 [icmpOutAddrMaskReps].

              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 brackets):

              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].
                     per second [icmpOutDestUnreachs].

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

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

              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 [icmpOutParmProbs].

              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
                     [icmpOutSrcQuenchs].

              iredir/s
                     The number of ICMP Redirect messages received per  second
                     [icmpInRedirects].

              oredir/s
                     The  number  of  ICMP  Redirect  messages sent per second
                     [icmpOutRedirects].

              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  (for-
              mal SNMP names between square brackets):

              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 [tcpPassiveOpens].

              iseg/s
                     The total number of segments received per second, includ-
                     ing those received  in  error  [tcpInSegs].   This  count
                     includes  segments received on currently established con-
                     nections.
                     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 tran-
                     sition  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  [tcpEstabRe-
                     sets].

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

              isegerr/s
                     The total number of segments received in error (e.g., bad
                     TCP checksums) 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  (for-
              mal SNMP names between square brackets):

              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 dis-
              played:

              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  (for-
              mal SNMP names between square brackets):

              irec6/s
                     The  total number of input datagrams received from inter-
                     faces per  second,  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
                     [ipv6IfStatsOutForwDatagrams].

              idel6/s
                     The  total number of datagrams successfully delivered per
                     second to IPv6 user-protocols (including ICMP)  [ipv6IfS-
                     tatsInDelivers].

              orq6/s
                     The  total  number  of  IPv6  datagrams  which local IPv6
                     user-protocols (including ICMP) supplied  per  second  to
                     IPv6  in  requests  for  transmission  [ipv6IfStatsOutRe-
                     quests].  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  [ipv6IfStat-
                     sReasmReqds].

              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 interface [ipv6IfStatsOutMcastPkts].

              fragok6/s
                     The number of IPv6 datagrams that have been  successfully
                     fragmented  at this output interface per second [ipv6IfS-
                     tatsOutFragOKs].

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

              iadrer6/s
                     The  number  of  input  datagrams  discarded  per  second
                     because the IPv6 address in their IPv6 header's  destina-
                     tion 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 unallo-
                     cated 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  [ipv6IfStatsInAddr-
                     Errors].

              iukwnp6/s
                     The number of locally-addressed datagrams  received  suc-
                     cessfully  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)  [ipv6IfStatsInDiscards].  Note  that this
                     counter does not include any  datagrams  discarded  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) [ipv6IfStatsOutDiscards]. Note that
                     this counter would include datagrams counted in fwddgm6/s
                     if any such packets met this (discretionary) discard cri-
                     terion.

              inort6/s
                     The  number  of  input  datagrams  discarded  per  second
                     because no route could be found to transmit them to their
                     destination [ipv6IfStatsInNoRoutes].

              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.) [ipv6IfStatsReasmFails].  Note that this is
                     tatsInTruncatedPkts].

              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 inter-
                     face per second  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 inter-
                     face per second [ipv6IfIcmpOutEchoReplies].

              igmbq6/s
                     The  number  of  ICMPv6  Group  Membership Query messages
                     received by the interface per second  [ipv6IfIcmpInGroup-
                     MembQueries].

              igmbr6/s
                     The  number  of ICMPv6 Group Membership Response messages
                     received by the interface per second  [ipv6IfIcmpInGroup-
                     MembResponses].

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

              igmbrd6/s
                     The number of ICMPv6 Group Membership Reduction  messages
                     received  by the interface per second [ipv6IfIcmpInGroup-
                     MembReductions].

              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].
                     the interface per second [ipv6IfIcmpInNeighborSolicits].

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

              inbad6/s
                     The   number  of  ICMP  Neighbor  Advertisement  messages
                     received by the interface per second [ipv6IfIcmpInNeighb-
                     orAdvertisements].

              onbad6/s
                     The  number  of ICMP Neighbor Advertisement messages sent
                     by the interface per second  [ipv6IfIcmpOutNeighborAdver-
                     tisements].

              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  inter-
                     face  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 [ipv6IfIcmpInDestUn-
                     reachs].

              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 interface 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
                     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/sysstat/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 processor.

       -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/sysstat/sys-
              stat.ioconf.

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

              runq-sz
                     System load average for the past 5 minutes.

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

              blocked
                     Number of tasks currently blocked,  waiting  for  I/O  to
                     complete.

       -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 kiB or 8
                     kiB 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.

       -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  kilo-
                     bytes.

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

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

              %commit
                     been less recently  used.  It  is  more  eligible  to  be
                     reclaimed for other purposes).

              kbdirty
                     Amount of memory in kilobytes waiting to get written back
                     to the disk.

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

              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 mem-
                     ory 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.

       -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 speci-
              fied. The default starting 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 ).

       -t     When reading data from a daily  data  file,  indicate  that  sar
              should  display the timestamps in the original local 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 follow-
              ing fields:

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

              %usr
                     Percentage of CPU utilization that occurred while execut-

              %sys
                     Percentage of CPU utilization that occurred while execut-
                     ing at the system level (kernel). Note  that  this  field
                     does  NOT  include time spent servicing hardware or soft-
                     ware 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 vir-
                     tual 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 vir-
                     tual processor.

              %gnice
                     Percentage of time spent by the CPU  or  CPUs  to  run  a
                     niced guest.

              %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  activ-
              ity  at  all (0.00 for every field) is a disabled (offline) pro-
              cessor.

       -V     Print version number then exit.

       -v     Report status of inode, file and other kernel tables.  The  fol-
              lowing 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.


       -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.

       -y     Report TTY devices 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  col-
                     umn.

              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.


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/sysstat directory. This  variable  may  be  useful  for
              servers with users located across several timezones.
              '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 ker-
       nel  version  used.  sar assumes that you are using at least a 2.6 ker-
       nel.

FILES
       /var/log/sysstat/sadd
              Indicate the daily data file, where the dd parameter is a number
              representing 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),  pidstat(1), mpstat(1), iostat(1),
       vmstat(8)

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



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