iostat: (r/s + w/s) * svctm = %util on Linux
iostat -x is very useful to check disk i/o activities. Sometimes it is said that "check %util is less than 100%" or "check svctm is less than 50ms", but please do not fully trust these numbers. For example, the following two cases (DBT-2 load on MySQL) used same disks (two HDD disks, RAID1) and reached almost 100% util, but performance numbers were very different (no.2 was about twice as fast as n
iostat ã®è¦‹æ–¹ - ablog
出力例 $ iostat -x 30 avg-cpu: %user %nice %system %iowait %steal %idle 0.87 0.01 2.53 0.49 0.00 96.11 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.05 16.03 0.36 13.74 5.77 238.22 17.31 0.15 10.39 0.98 1.38 sda1 0.00 0.00 0.00 0.00 0.00 0.00 15.53 0.00 12.81 11.47 0.00 sda2 0.05 16.03 0.36 13.74 5.77 238.22 17.31 0.15 10.39 0.98 1.38 avg-cpu: %user %nice %syst
iostat await svctm 㮠見ã‹ãŸã€è€ƒãˆæ–¹
4. 4  下記ã¯iostat -x ã®ãƒã‚°ã®ã‚µãƒ³ãƒ—ル iostat -x 1 ： avg-cpu: %user %nice %system %iowait %steal %idle 0.76 0.00 0.51 1.52 0.00 97.22 Device: rrqm/s … rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util sda 0.00 … 2000.00 88.00 208.80 0.14 13.70 8.00 8.00 sdb 0.00 … 0.00 24.00 8.00 0.09 31.33 21.67 6.50 avg-cpu: %user %nice %system %iowait %steal %idle 0.76 0.00 0.51 0.25 0.00 98.48 Device: rrqm/s … rsec/s ws
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How I Use iostat and vmstat for Performance Analysis - Yubin Xia
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