rrqm/s ----隊列中每秒鐘合并的讀請求數量
The number of read requests merged per second that were queued to the device.
wrqm/s ----隊列中每秒鐘合并的寫請求數量
The number of write requests merged per second that were queued to the device.
r/s ----每秒 從該device讀取請求的個數
The number of read requests that were issued to the device per second.
w/s ----每秒 向該device寫入請求的個數
The number of write requests that were issued to the device per second.
rMB/s ----每秒 從該device讀取的MB數.
The number of megabytes read from the device per second.
wMB/s ----每秒 向該device寫入的MB數.
The number of megabytes written to the device per second.
await ----這個我了解有點類似awr中sql的elapsed time(包括cpu time和各種wait的wait time)
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 servicing them.
svctm ----這個我了解有點類似awr中sql的cpu time
The average service time (in milliseconds) for I/O requests that were issued to the device.
Warning! Do not trust this field any more. This field will be removed in a future sysstat version.
%util
Percentage of elapsed time during which I/O requests were issued to the device (bandwidth utilization for the device).
Device saturation occurs when this value is close to 100%.
[[email protected] ~]# iostat -dmx 1 10000
Linux 2.6.32-573.el6.x86_64 (targetdb12) 01/17/2018 _x86_64_ (4 CPU)
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.36 0.32 0.94 0.19 0.01 0.00 30.03 0.02 20.30 6.95 0.78
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 46490.00 0.00 501.00 0.00 183.56 750.36 4.85 9.67 0.84 41.90
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 4.00 0.00 3.00 0.00 0.03 18.67 0.02 8.00 6.67 2.00
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 58842.00 0.00 653.00 0.00 226.45 710.22 3.79 5.71 0.63 41.30
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 104273.00 2.00 1097.00 0.01 417.55 778.13 10.35 9.48 0.49 53.80
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 97330.00 0.00 974.00 0.00 384.00 807.43 7.21 7.40 0.42 41.20
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 111793.07 3.96 947.52 0.03 422.72 909.94 19.77 20.54 0.51 48.61
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 100749.00 0.00 957.00 0.00 415.14 888.41 17.13 18.15 0.53 50.60
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 97419.00 0.00 885.00 0.00 384.00 888.62 22.41 25.32 0.59 52.60
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 129891.00 2.00 1181.00 0.01 512.00 886.38 25.38 21.45 0.51 60.70
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 111172.90 0.00 927.10 0.00 436.43 964.08 19.59 21.12 0.43 40.19
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 116620.43 0.00 1045.16 0.00 461.32 903.95 14.19 13.59 0.43 45.05
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 104748.04 0.00 930.39 0.00 410.92 904.52 11.28 12.12 0.40 37.45
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 89123.00 1.00 803.00 0.00 320.00 815.13 8.57 9.17 0.46 36.90
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 98767.00 1.00 845.00 0.00 406.12 983.16 67.51 80.98 0.83 70.40
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 108823.00 4.00 1284.00 0.04 444.20 706.35 5.73 4.60 0.51 65.90
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 106607.92 0.00 924.75 0.00 422.12 934.85 11.57 12.53 0.33 30.40
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 111299.00 0.00 1000.00 0.00 438.67 898.39 9.72 9.72 0.44 44.30
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 32454.00 13.00 314.00 0.11 128.00 802.37 3.81 11.65 0.87 28.40
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