iostat "await" like counter for measuring nfs latency

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Doing some iscsi and nfs performance testing, I realized that iostat(1)
doesn't support an "await" (*) like counter for measuring nfs latency.

Can tracking nfs latency be done in other means? is there a plan to
extend the nfs iostats code to include such/similar counter?

thanks,

Or.


(*) 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.


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