When I try iostat disk5, I get the error:

iostat: could not record 'disk5' for monitoring

Iostat works with my other drives, and with the individual disks which make up the RAID volume. How can I get the speed of disk5, which is an AppleRAID volume?


BSD iostat - yeeeecchhhhh. There are some things that Gnu/Linux just does better.

What happens when you try iostat -d -n 9 - that should give you an iostat on the first 9 drives hooked up (if you have 9 drives).

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  • It omits the RAID volume, and it shows each of the 4 disks that make it up. – Elliott Jan 24 '14 at 14:51
  • Yes, I was afraid of that. The drive system sees the physical disks not the logical drive. You may be stuck. – Tony Williams Jan 25 '14 at 0:09

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