On 01/05/11 06:51, Mark Knecht wrote:

On Wed, Apr 27, 2011 at 10:31 PM, Wolfgang Denk[off-list ref]  wrote:

quoted

Dear Phil Turmel,

In message[ref]  you wrote:

quoted

Hmmm.  Since its not swap, this would make me worry about the hardware.  Have you considered shuffling SATA port assignments to see if a pattern shows up?  Also consider moving some of the drive power load to another PS.

I do not think this is hardware related.  I see this behaviour on at
least 5 different machines which show no other problems except for the
mismatch count in the RAID 1 partitins that hold the /boot partition.

root@srv:/server# grep . /sys/block/md?/md/mismatch_cnt
/sys/block/md0/md/mismatch_cnt:0
/sys/block/md1/md/mismatch_cnt:128
/sys/block/md2/md/mismatch_cnt:0
/sys/block/md3/md/mismatch_cnt:41728
/sys/block/md4/md/mismatch_cnt:896
/sys/block/md5/md/mismatch_cnt:0
/sys/block/md6/md/mismatch_cnt:4352

root@srv:/server# cat /proc/mdstat | grep md[1346]
md6 : active raid1 sdp6[0] sdo6[1]
md4 : active raid1 sdp3[0] sdo3[1]
md3 : active raid1 sdp2[0] sdo2[1]
md1 : active raid1 sdp1[0] sdo1[1]

root@srv:/server# cat /etc/fstab | grep md[1346]
/dev/md1        /               ext4 
errors=remount-ro,commit=30,noatime     0 1
/dev/md6        /raid0          ext4    defaults,commit=30,noatime      0 1
/dev/md4        /home           ext4    defaults,commit=30,noatime      0 1
/dev/md3        none            swap    sw

I see them _all_ the time on RAID1's..

When I configured this system _years_ ago, I did not know any better, so 
it's a bit of a mish-mash.

The machine also has a 10 drive RAID-6 and a 3 drive RAID-5. The only 
time I've seen mismatches on those is when I used a SIL 3132 controller 
and it trashed the RAID-6.

Brad