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-d The -d option is exclusive of the -c option and displays only the device utilization report.
-k Display statistics in kilobytes per second instead of blocks per second.
-t Print the time for each report displayed.
-x Display extended statistics.
$ iostat 1 2
Linux 2.6.18-274.el5 (myserver1) 11/09/15
avg-cpu: %user %nice %system %iowait %steal %idle <- First time average of from the machine start-up
0.11 0.22 8.08 0.02 0.00 91.57
Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
sda 0.83 19.56 7.50 625971 240102
sda1 0.00 0.06 0.00 1967 14
sda2 0.82 19.44 7.50 621946 240088
sda3 0.00 0.05 0.00 1618 0
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 9.28 0.00 0.00 90.72
Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
sda 0.00 0.00 0.00 0 0
sda1 0.00 0.00 0.00 0 0
sda2 0.00 0.00 0.00 0 0
sda3 0.00 0.00 0.00 0 0
$
$ iostat -xtk 1 2
Linux 2.6.18-274.el5 (myserver1) 11/09/15
Time: 17:24:45 <- First time average of from the machine start-up
avg-cpu: %user %nice %system %iowait %steal %idle
0.11 0.22 8.08 0.02 0.00 91.57
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
sda 0.24 0.55 0.44 0.39 9.77 3.75 32.75 0.00 3.08 1.10 0.09
sda1 0.05 0.00 0.00 0.00 0.03 0.00 23.58 0.00 2.12 2.04 0.00
sda2 0.17 0.55 0.44 0.39 9.71 3.75 32.77 0.00 3.09 1.10 0.09
sda3 0.02 0.00 0.00 0.00 0.03 0.00 52.19 0.00 0.94 0.77 0.00
Time: 17:24:46
avg-cpu: %user %nice %system %iowait %steal %idle
0.00 0.00 7.14 0.00 0.00 92.86
Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
sda3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
$ iostat -dxtk 1 2 Linux 2.6.18-274.el5 (myserver1) 11/18/15 Time: 07:41:47 <- First time average of from the machine start-up Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util sda 33.73 12.37 22.02 12.22 913.93 98.33 59.13 0.11 3.11 0.91 3.12 sda1 7.89 0.00 0.35 0.01 4.52 0.01 25.19 0.00 0.81 0.68 0.02 sda2 22.43 12.37 21.43 12.21 904.67 98.32 59.64 0.11 3.15 0.92 3.08 sda3 3.26 0.00 0.14 0.00 3.73 0.00 53.93 0.00 0.60 0.57 0.01 Time: 07:41:48 Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sda2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 sda3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00