Useful SAR commands
An abbreviation of SAR is System Activity Reporter which is an important tool for system administrators to get the performance overview of the server at different point of time.
Using sar commaned, we can know the cpu, memory , disk etc, utilization for the current or for the past.
CPU usage of all cpu’s
[root@rhel6-1 ~]# sar -u 2 5 Linux 2.6.32-431.el6.x86_64 (rhel6-1) 05/16/2017 _x86_64_ (1 CPU) 02:26:46 PM CPU %user %nice %system %iowait %steal %idle 02:26:48 PM all 0.00 0.00 0.00 0.00 0.00 100.00 02:26:50 PM all 0.00 0.00 0.00 0.00 0.00 100.00 02:26:52 PM all 0.00 0.00 0.00 0.00 0.00 100.00 02:26:54 PM all 0.00 0.00 0.00 0.00 0.50 99.50 02:26:56 PM all 0.00 0.00 0.50 0.00 0.00 99.50 Average: all 0.00 0.00 0.10 0.00 0.10 99.80 [root@rhel6-1 ~]#
CPU Usage of Individual CPU or Core
[root@rhel6-1 ~]# sar -P ALL 1 1 Linux 2.6.32-431.el6.x86_64 (rhel6-1) 05/16/2017 _x86_64_ (1 CPU) 02:14:10 PM CPU %user %nice %system %iowait %steal %idle 02:14:11 PM all 0.00 0.00 0.00 0.00 0.00 100.00 02:14:11 PM 0 0.00 0.00 0.00 0.00 0.00 100.00 Average: CPU %user %nice %system %iowait %steal %idle Average: all 0.00 0.00 0.00 0.00 0.00 100.00 Average: 0 0.00 0.00 0.00 0.00 0.00 100.00 [root@rhel6-1 ~]#
Memory Free and Used (sar -r)
[root@rhel6-1 ~]# sar -r 1 3 Linux 2.6.32-431.el6.x86_64 (rhel6-1) 05/16/2017 _x86_64_ (1 CPU)> 02:19:13 PM kbmemfree kbmemused %memused kbbuffers kbcached kbcommit %commit 02:19:14 PM 837980 182412 17.88 55032 54104 281164 9.11 02:19:15 PM 837980 182412 17.88 55032 54104 281164 9.11 02:19:16 PM 837980 182412 17.88 55032 54104 281164 9.11 Average: 837980 182412 17.88 55032 54104 281164 9.11
Swap Space Used
[root@rhel6-1 ~]# sar -S 1 3 Linux 2.6.32-431.el6.x86_64 (rhel6-1) 05/16/2017 _x86_64_ (1 CPU) 02:19:27 PM kbswpfree kbswpused %swpused kbswpcad %swpcad 02:19:28 PM 2064376 0 0.00 0 0.00 02:19:29 PM 2064376 0 0.00 0 0.00 02:19:30 PM 2064376 0 0.00 0 0.00 Average: 2064376 0 0.00 0 0.00
Overall I/O Activities
[root@rhel6-1 ~]# sar -b 1 3 Linux 2.6.32-431.el6.x86_64 (rhel6-1) 05/16/2017 _x86_64_ (1 CPU) 02:19:33 PM tps rtps wtps bread/s bwrtn/s 02:19:34 PM 0.00 0.00 0.00 0.00 0.00 02:19:35 PM 0.00 0.00 0.00 0.00 0.00 02:19:36 PM 0.00 0.00 0.00 0.00 0.00 Average: 0.00 0.00 0.00 0.00 0.00
Individual Block Device I/O Activities
[root@rhel6-1 ~]# sar -d 1 1 Linux 2.6.32-431.el6.x86_64 (rhel6-1) 05/16/2017 _x86_64_ (1 CPU) 02:19:39 PM DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util 02:19:40 PM dev8-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 02:19:40 PM dev252-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 02:19:40 PM dev253-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 02:19:40 PM dev253-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 02:19:40 PM dev253-2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Average: DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util Average: dev8-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Average: dev252-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Average: dev253-0 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Average: dev253-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Average: dev253-2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
[root@rhel6-1 ~]# sar -p -d 1 1 Linux 2.6.32-431.el6.x86_64 (rhel6-1) 05/16/2017 _x86_64_ (1 CPU) 02:19:45 PM DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util 02:19:46 PM sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 02:19:46 PM vda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 02:19:46 PM vg_rhel61-lv_root 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 02:19:46 PM vg_rhel61-lv_swap 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 02:19:46 PM vg_scsi-lv_iscsi 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Average: DEV tps rd_sec/s wr_sec/s avgrq-sz avgqu-sz await svctm %util Average: sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Average: vda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Average: vg_rhel61-lv_root 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Average: vg_rhel61-lv_swap 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Average: vg_scsi-lv_iscsi 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
[root@rhel6-1 ~]# sar -w 1 3 Linux 2.6.32-431.el6.x86_64 (rhel6-1) 05/16/2017 _x86_64_ (1 CPU) 02:19:54 PM proc/s cswch/s 02:19:55 PM 0.00 77.78 02:19:56 PM 0.00 82.00 02:19:57 PM 0.00 78.22 Average: 0.00 79.33
[root@rhel6-1 ~]# sar -q 1 3 Linux 2.6.32-431.el6.x86_64 (rhel6-1) 05/16/2017 _x86_64_ (1 CPU) 02:19:59 PM runq-sz plist-sz ldavg-1 ldavg-5 ldavg-15 02:20:00 PM 0 180 0.00 0.00 0.00 02:20:01 PM 0 180 0.00 0.00 0.00 02:20:02 PM 0 180 0.00 0.00 0.00 Average: 0 180 0.00 0.00 0.00
[root@rhel6-1 ~]# sar -n DEV 1 1 Linux 2.6.32-431.el6.x86_64 (rhel6-1) 05/16/2017 _x86_64_ (1 CPU) 02:20:05 PM IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s 02:20:06 PM lo 0.00 0.00 0.00 0.00 0.00 0.00 0.00 02:20:06 PM eth0 1.00 0.00 0.05 0.00 0.00 0.00 0.00 02:20:06 PM eth1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Average: IFACE rxpck/s txpck/s rxkB/s txkB/s rxcmp/s txcmp/s rxmcst/s Average: lo 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Average: eth0 1.00 0.00 0.05 0.00 0.00 0.00 0.00 Average: eth1 0.00 0.00 0.00 0.00 0.00 0.00 0.00
[root@rhel6-1 ~]# sar -q -f /var/log/sa/sa15 -s 10:00:01 Linux 2.6.32-431.el6.x86_64 (rhel6-1) 05/15/2017 _x86_64_ (1 CPU) 02:30:01 PM runq-sz plist-sz ldavg-1 ldavg-5 ldavg-15 02:40:01 PM 1 114 1.00 1.00 1.00 02:50:01 PM 1 114 1.00 1.00 1.00 03:00:01 PM 1 114 1.00 1.00 1.00 03:10:01 PM 1 114 1.00 1.00 1.00 07:40:01 PM 1 114 1.00 1.00 1.00 07:50:01 PM 1 114 1.00 1.00 1.00 08:00:01 PM 1 114 1.00 1.00 1.00 08:10:01 PM 1 114 1.00 1.00 1.00 08:20:01 PM 1 114 1.00 1.00 1.00 08:30:01 PM 1 114 1.00 1.00 1.00 Average: 1 114 1.00 1.00 1.00
[root@rhel6-1 ~]# sar -q -f /var/log/sa/sa15 -s 10:00:01 | head -n 10 Linux 2.6.32-431.el6.x86_64 (rhel6-1) 05/15/2017 _x86_64_ (1 CPU) 02:30:01 PM runq-sz plist-sz ldavg-1 ldavg-5 ldavg-15 02:40:01 PM 1 114 1.00 1.00 1.00 02:50:01 PM 1 114 1.00 1.00 1.00 03:00:01 PM 1 114 1.00 1.00 1.00 03:10:01 PM 1 114 1.00 1.00 1.00 07:40:01 PM 1 114 1.00 1.00 1.00 07:50:01 PM 1 114 1.00 1.00 1.00 08:00:01 PM 1 114 1.00 1.00 1.00
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