iostat \/ vmstat \/ mpstat are some tools to monitor server performance. <\/p>\n
* iostat reports CPU, disk I\/O, and NFS statistics.<\/p>\n
* vmstat reports virtual memory statistics.<\/p>\n
* mpstat reports processors statictics.<\/p>\n
iostat <\/p>\n
Iostat without any argument displays information about the CPU usage, and I\/O statistics about all the partitions on the system are showing:<\/p>\n
# iostat <\/p>\n
Linux 2.6.18-164.el5 (cloudcc.ctechz.blogspot.com) 03\/11\/2012<\/p>\n
avg-cpu: %user %nice %system %iowait %steal %idle
\n 1.98 17.92 8.59 0.33 0.00 71.17<\/p>\n
Device: tps Blk_read\/s Blk_wrtn\/s Blk_read Blk_wrtn
\nsda 13.89 33.54 365.15 14323873 155932064
\nsda1 13.84 32.34 363.73 13808779 155327336
\nsda2 0.05 1.20 1.42 514566 604728<\/p>\n
Display only cpu statistics<\/p>\n
# iostat -c<\/p>\n
Linux 2.6.18-164.el5 (cloudcc.ctechz.blogspot.com) 03\/11\/2012<\/p>\n
avg-cpu: %user %nice %system %iowait %steal %idle
\n 1.98 17.92 8.59 0.33 0.00 71.17<\/p>\n
Display only disk I\/O statistics<\/p>\n
# iostat -d<\/p>\n
Linux 2.6.18-164.el5 (cloudcc.ctechz.blogspot.com) 03\/11\/2012<\/p>\n
Device: tps Blk_read\/s Blk_wrtn\/s Blk_read Blk_wrtn
\nsda 13.89 33.53 365.04 14323921 155949184
\nsda1 13.84 32.32 363.62 13808827 155344456
\nsda2 0.05 1.20 1.42 514566 604728<\/p>\n
Display only network statistics<\/p>\n
-n, displays only the device and NFS statistics.<\/p>\n
# iostat -n<\/p>\n
Linux 2.6.18-164.el5 (cloudcc.ctechz.blogspot.com) 03\/11\/2012<\/p>\n
avg-cpu: %user %nice %system %iowait %steal %idle
\n 1.98 17.93 8.59 0.33 0.00 71.17<\/p>\n
Device: tps Blk_read\/s Blk_wrtn\/s Blk_read Blk_wrtn
\nsda 13.89 33.52 365.00 14323937 155957552
\nsda1 13.84 32.32 363.58 13808843 155352824
\nsda2 0.05 1.20 1.42 514566 604728<\/p>\n
Device: rBlk_nor\/s wBlk_nor\/s rBlk_dir\/s wBlk_dir\/s rBlk_svr\/s
\n wBlk_svr\/s rops\/s wops\/s<\/p>\n
192.168.1.4:\/home\/pac 90.67 0.00 0.00 0.00 5.33 0.00
\n192.168.1.4:\/bkp 8.74 0.00 0.00 0.00 8.74 0.00
\n192.168.1.8:\/media 0.02 0.00 0.00 0.00 0.01 0.00<\/p>\n
Display I\/O data in MB\/second<\/p>\n
By default iostat, displays the device I\/O statistics in Blocks. To change it to MB, use -m as shown <\/p>\n
# iostat -m<\/p>\n
Linux 2.6.18-164.el5 (cloudcc.ctechz.blogspot.com) 03\/11\/2012<\/p>\n
avg-cpu: %user %nice %system %iowait %steal %idle
\n 1.98 17.93 8.59 0.33 0.00 71.16<\/p>\n
Device: tps MB_read\/s MB_wrtn\/s MB_read MB_wrtn
\nsda 13.88 0.02 0.18 6994 76165
\nsda1 13.83 0.02 0.18 6742 75869
\nsda2 0.05 0.00 0.00 251 295<\/p>\n
Display I\/O statistics only for a device<\/p>\n
# iostat -p sda<\/p>\n
Display timestamp information<\/p>\n
# iostat -t<\/p>\n
Linux 2.6.18-164.el5 (cloudcc.ctechz.blogspot.com) 03\/11\/2012<\/p>\n
Time: 05:51:24 PM
\navg-cpu: %user %nice %system %iowait %steal %idle
\n 1.98 17.93 8.59 0.33 0.00 71.16<\/p>\n
Device: tps Blk_read\/s Blk_wrtn\/s Blk_read Blk_wrtn
\nsda 13.88 33.49 364.77 14324049 156006600
\nsda1 13.83 32.29 363.35 13808955 155401872
\nsda2 0.05 1.20 1.41 514566 604728<\/p>\n
Execute Every x seconds – y number of times<\/p>\n
# iostat 2
\n# iostat 2 3 — execute every 2 seconds for 3 times<\/p>\n
Display LVM statistic<\/p>\n
# iostat -N<\/p>\n
# vmstat<\/p>\n
procs ———–memory—————– —swap– ——io—- —system– —–cpu–
\n r b swpd free buff cache si so bi bo in cs us sy id wa st
\n 1 0 196112 75232 151884 611352 0 0 8 91 45 40 20 9 71 0 0<\/p>\n
vmstat output contains the following fields:<\/p>\n
Procs \u2013 r: Total number of processes waiting to run
\n Procs \u2013 b: Total number of busy processes
\n Memory \u2013 swpd: Used virtual memory
\n Memory \u2013 free: Free virtual memory
\n Memory \u2013 buff: Memory used as buffers
\n Memory \u2013 cache: Memory used as cache.
\n Swap \u2013 si: Memory swapped from disk (for every second)
\n Swap \u2013 so: Memory swapped to disk (for every second)
\n IO \u2013 bi: Blocks in. i.e blocks received from device (for every second)
\n IO \u2013 bo: Blocks out. i.e blocks sent to the device (for every second)
\n System \u2013 in: Interrupts per second
\n System \u2013 cs: Context switches
\n CPU \u2013 us, sy, id, wa, st: CPU user time, system time, idle time, wait time<\/p>\n
Display active and inactive memory
\n# vmstat -a<\/p>\n
procs ———–memory———- —swap– —–io—- –system– —–cpu——
\n r b swpd free inact active si so bi bo in cs us sy id wa st
\n 1 0 196112 75236 224864 787620 0 0 8 91 45 41 20 9 71 0 0<\/p>\n
Display number of forks since last boot<\/p>\n
This displays all the fork system calls made by the system since the last boot.<\/p>\n
# vmstat -f
\n 500235 forks <\/p>\n
Execute Every x seconds
\n# vmstat 2
\n# vmstat 2 5<\/p>\n
Display slab info
\n# vmstat -m<\/p>\n
Display statistics in a table format
\n# vmstat -s<\/p>\n
Display disk statistics
\n# vmstat -d<\/p>\n
Display statistics for a partition
\n # vmstat -p \/dev\/sda1<\/p>\n
Display in MB
\n# vmstat -S m<\/p>\n","protected":false},"excerpt":{"rendered":"
iostat \/ vmstat \/ mpstat are some tools to monitor server performance. <\/p>\n
* iostat reports CPU, disk I\/O, and NFS statistics.<\/p>\n
* vmstat reports virtual memory statistics.<\/p>\n
* mpstat reports processors statictics.<\/p>\n
iostat <\/p>\n
Iostat without any argument displays information about the CPU usage, and I\/O statistics about all the partitions […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[],"_links":{"self":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/2365"}],"collection":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2365"}],"version-history":[{"count":2,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/2365\/revisions"}],"predecessor-version":[{"id":2367,"href":"https:\/\/mohan.sg\/index.php?rest_route=\/wp\/v2\/posts\/2365\/revisions\/2367"}],"wp:attachment":[{"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2365"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2365"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mohan.sg\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2365"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}