On 01/26/2019 04:49 AM, Harald Dunkel wrote:
> Hi folks,
>
> I initiated a check of my RAID1 (2 disks) this morning. mismatch_cnt
> is at 128 by now.
>
> Apparently I can map block numbers to files using debugfs, looking
> closely at block sizes and partition offsets, but how can I tell which
> blocks within md0 are affected?
>
>
> Hopefully I wasn't too blind to see. Every helpful comment is highly
> appreciated
>
> Harri
>
Sorry for the late reply,
In most cases this is just a harmless atavistic quirk. I have seen this
before on a couple of occasions an ultimately the mismatch just vanishes. For
example, I scrub weekly through a cron script and log the results. In 2017 I
saw a couple of them, e.g.
------- 2017 --------
...
Aug 21 03:01:01 '/dev/md0' mismatch_cnt = 0
Aug 21 03:07:01 '/dev/md1' mismatch_cnt = 0
Aug 21 05:01:02 '/dev/md2' mismatch_cnt = 0
Aug 21 10:11:02 '/dev/md4' mismatch_cnt = 0
Aug 28 03:01:01 '/dev/md0' error: mismatch_cnt = 128
Aug 28 03:06:01 '/dev/md1' mismatch_cnt = 0
Aug 28 04:59:02 '/dev/md2' mismatch_cnt = 0
Aug 28 10:09:02 '/dev/md4' mismatch_cnt = 0
Sep 4 03:01:02 '/dev/md0' error: mismatch_cnt = 128
Sep 4 03:06:02 '/dev/md1' mismatch_cnt = 0
Sep 4 05:00:02 '/dev/md2' mismatch_cnt = 0
Sep 4 10:10:03 '/dev/md4' mismatch_cnt = 0
Sep 11 03:01:02 '/dev/md0' mismatch_cnt = 0
Sep 11 03:06:02 '/dev/md1' mismatch_cnt = 0
Sep 11 04:59:02 '/dev/md2' mismatch_cnt = 0
Sep 11 10:09:03 '/dev/md4' mismatch_cnt = 0
Sep 18 03:01:01 '/dev/md0' mismatch_cnt = 0
Sep 18 03:06:01 '/dev/md1' mismatch_cnt = 0
Sep 18 04:59:02 '/dev/md2' mismatch_cnt = 0
Sep 18 10:09:02 '/dev/md4' mismatch_cnt = 0
Sep 25 03:01:01 '/dev/md0' error: mismatch_cnt = 128
Sep 25 03:06:01 '/dev/md1' mismatch_cnt = 0
Sep 25 04:59:02 '/dev/md2' mismatch_cnt = 0
Sep 25 10:09:02 '/dev/md4' mismatch_cnt = 0
Oct 2 03:01:01 '/dev/md0' mismatch_cnt = 0
Oct 2 03:06:01 '/dev/md1' mismatch_cnt = 0
Oct 2 04:59:02 '/dev/md2' mismatch_cnt = 0
Oct 2 10:09:02 '/dev/md4' mismatch_cnt = 0
Oct 9 03:01:02 '/dev/md0' mismatch_cnt = 0
Oct 9 03:06:02 '/dev/md1' mismatch_cnt = 0
Oct 9 05:05:02 '/dev/md2' mismatch_cnt = 0
Oct 9 10:15:03 '/dev/md4' mismatch_cnt = 0
<snip>
none since
--
David C. Rankin, J.D.,P.E.
