Re: High IO Wait with RAID 1

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On Fri, Mar 13, 2009 at 11:29 AM, Ryan Wagoner <rswagoner@xxxxxxxxx> wrote:
> The other system with the onboard ICH controller exhibits the same
> symptoms so I think my card is configured correctly. The interesting
> part of this is I can kick off a resync on all three RAID volumes and
> the system load and io wait is low. The rebuild rate is 85M/s for the
> RAID 5 volume and 65M/s for the RAID 1 volumes, which is the max each
> individual drive can do.

The load from rebuilding the raid doesn't show up in system load or io
wait as it's done in-kernel.  If you run some other IO intensive
processes during the rebuild you should notice that it will run a bit
slower and io wait should be higher.

-Dave
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