Output of the Iostat

Source: Internet
Author: User

The first line shows the average value since the subsystem was started, and the next report shows the average of the increments, one row per Device

device:rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await SVCTM%util

SDA 0.00 23.75 0.00 5.79 0.00 236.33 40.83 0.02 3.10 0.76 0.44
Dm-0 0.00 0.00 0.00 29.54 0.00 236.33 8.00 0.11 3.56 0.15 0.44
Dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

rrqm/s wrqm/s

Merged read and write requests per second, "merged" means that the operating system takes multiple logical requests from the queue to merge into a single request to the actual disk

r/s W/S Read and write requests sent to the device per second

RSEC/S wsec/s number of reads and writes per second, some systems are also output to rkb/s and wkb/s, which means the number of kilobytes per second read and write

AVGRQ-SZ number of sectors requested

Avgqu-sz number of requests waiting in the device queue-----------didn't understand.

The number of milliseconds spent waiting on a disk

SVCTM the number of milliseconds that the service request took, not including the queue time-------execution time?

%util percentage of time spent at least one active request ——-----------didn't understand.

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