tracking parity mismatches to a failing disk

tracking parity mismatches to a failing disk

[Michael Peterson]

I'm trying to identify the source of a non-zero mismatch_cnt on a
six-disk RAID6 md array.  I think I've identified it as /dev/sdf since
that is the only device with a non-zero value in
/sys/block/md0/md/dev-sd*/errors.  Is that the right way to track parity
mismatches back to a disk?

OS is CentOS 5.8 -> mdadm 2.6.9

Thanks,
Michael

Re: tracking parity mismatches to a failing disk

[NeilBrown]

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On Wed, 09 May 2012 15:16:08 -0400 Michael Peterson
<Michael.Peterson@duke.edu> wrote:

> I'm trying to identify the source of a non-zero mismatch_cnt on a
> six-disk RAID6 md array.  I think I've identified it as /dev/sdf since
> that is the only device with a non-zero value in
> /sys/block/md0/md/dev-sd*/errors.  Is that the right way to track parity
> mismatches back to a disk?
> 
> OS is CentOS 5.8 -> mdadm 2.6.9

There is a program in the mdadm source distro called "raid6check" which can
possibly help you.

NeilBrown

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