ZFS Primer

Sometimes your ZFS drives on your disk runs away with you.

Then you quickly need commands to see what ZFS disk is the busiest.

Try this:

ssh to NAS/server

iostat -zxc 5

That will show you busiest. Then when you have zd you can do this:

find /dev -ls | grep zd144

That will be actual VM ID

iostat flags:

-z: Suppresses lines where all statistics are zero (helps reduce noise).
-x: Shows extended statistics for each device (includes metrics like %util, await, svctm).
-c: Displays CPU usage statistics.
5: Repeats the output every 5 seconds.

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