mismatch_cnt != 0, member content mismatch, but md says the mirror is good

Bruce Dawson jbd at codemeta.com
Sun Nov 1 22:16:34 EST 2009


Ben Scott wrote:
>   CentOS 5.4.  Running kernel is 2.6.18-92.1.22.el5.  The system has
> two disks, each with two partitions, making up two md mirror devices.
> md0 is ~ 509 MB and holds /boot; md1 is ~ 69 GB (the rest of the disk)
> and holds an LVM PE.    The following arrived in my mailbox today:
>
> On Sun, Nov 1, 2009 at 4:22 AM, Cron Daemon <root at liberty.gnhlug.org> wrote:
>   
>> /etc/cron.weekly/99-raid-check:
>>
>> WARNING: mismatch_cnt is not 0 on /dev/md0
>>     


Odd, we had a similar report on one of our Ubuntu systems last night. I
suspect there's a date-sensitive bug in there somewhere - possibly
tickled by a counter overflow (that system has been up "forever" too).

But consider this a wild guess.

I suspect a reboot will produce acceptable results, given the results of
your comparisons.

--Bruce


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