From: Brad Campbell <lists2009@fnarfbargle.com>
To: Mark Knecht <markknecht@gmail.com>
Cc: Wolfgang Denk <wd@denx.de>, Phil Turmel <philip@turmel.org>,
Linux-RAID <linux-raid@vger.kernel.org>
Subject: Re: High mismatch count on root device - how to best handle?
Date: Sun, 01 May 2011 22:50:32 +0800 [thread overview]
Message-ID: <4DBD7338.4060206@fnarfbargle.com> (raw)
In-Reply-To: <BANLkTikBkaWsDicptHsX3dz=RW5_bL2Z7A@mail.gmail.com>
On 01/05/11 06:51, Mark Knecht wrote:
> On Wed, Apr 27, 2011 at 10:31 PM, Wolfgang Denk<wd@denx.de> wrote:
>> Dear Phil Turmel,
>>
>> In message<4DB8BEFE.3020009@turmel.org> you wrote:
>>>
>>> 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
next prev parent reply other threads:[~2011-05-01 14:50 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-25 22:32 High mismatch count on root device - how to best handle? Mark Knecht
2011-04-26 1:30 ` Mark Knecht
2011-04-26 17:22 ` Mark Knecht
2011-04-26 19:38 ` Phil Turmel
2011-04-28 0:38 ` Mark Knecht
2011-04-28 1:12 ` Phil Turmel
2011-04-28 5:31 ` Wolfgang Denk
2011-04-30 22:51 ` Mark Knecht
2011-05-01 14:50 ` Brad Campbell [this message]
2011-05-01 17:13 ` Mark Knecht
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