New stats in iostat

Recelnty I've noticed that iostat (for RedHat sysstat-9.0.4-31 version) reports new fields: r_await and w_await.

Following online documentation: this stands for:

await
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.

r_await
The average time (in milliseconds) for read requests issued to the device to be served. This includes the time spent by the requests in queue and the time spent servicing them.

w_await
The average time (in milliseconds) for write requests issued to the device to be served. This includes the time spent by the requests in queue and the time spent servicing them.

So this seems it now quite easy to guess what kind of operations cause iowait for the device. Happy troubleshooting!

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Article | by Dr. Radut