[CentOS] mismatch_cnt after 5.3 -> 5.4 upgrade
reloftin at twcny.rr.com
Sun Oct 25 19:52:15 UTC 2009
On Sun, 2009-10-25 at 12:33 -0600, Devin Reade wrote:
> Saturday I did an upgrade from 5.3 (original install) to 5.4. Saturday
> night, /etc/cron.weekly reported the following:
> WARNING: mismatch_cnt is not 0 on /dev/md0
I had this happen on a box that I upgraded Friday. I went ahead and
tested each partition in the affected mirror with badblocks ( found no
errors ) and after multiple resyncs, there was no change. After similar
experiences with Google, I did run across a note saying that this went
away after a reboot. I broke down and applied the Micro$lop solution
( reboot ) and the error has gone away.
Like you, I'm interested in a better understanding of this issue, so if
anyone else has more info, I'm all ears. ;>
> md0 holds /boot and resides, mirrored, on sda1 and sdb1. md1 holds
> an LVM volume containing the remaining filesytems, including swap.
> The underlying hardware is just a few months hold, has passed the
> usual memtest stuff, and has been running 5.3 well for a few months.
> I'm *guessing* that due to the timing, this is related to the upgrade.
> I have to admit that I forgot myself and instead of doing the glibc
> updates as recommended, I only did:
> yum clean all
> yum update yum
> rpm -e --nodeps perl-5.8.8-18.el5_3.1.i386
> (see today's perl thread)
> yum update perl.x86_64
> yum update
> shutdown -r now
> I've taken a backup of /boot dump after the upgrade, but have not yet
> reenabled normal backups.
> My hunch is that something in the upgrade process touched sda1 but not
> sdb1, and that removing sdb1 from the mirror and reattaching it for
> resync would be sufficient, however I was looking for comments on this
> from anyone with experience or opinion on the matter. Googling the
> issue doesn't seem to turn up any recent related results.
> Also, could the upgrade have touched the bootblock on sda1 but not
> sdb1 and thus trigger this problem?
Ron Loftin reloftin at twcny.rr.com
"God, root, what is difference ?" Piter from UserFriendly
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