I have seen "mismatch_cnt is not 0" warnings in the past, but that has
always been with RAID 1 arrays, and with relatively small numbers on
/sys/block/md*/md/mismatch_cnt; my understanding was that this was not
actually critical.
However, after updating to Fedora 18, I get this message from all
updated
systems that have RAID 6 arrays, and with _huge_ numbers of
mismatch_cnt, like that:
fter updating to Fedora 18, I get this message from all updated
systems that have RAID 6 arrays, and with _huge_ numbers of
mismatch_cnt, like that:
# mdadm -q --detail /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Mon Jan 14 14:20:34 2013
Raid Level : raid6
Array Size : 1459617792 (1392.00 GiB 1494.65 GB)
Used Dev Size : 243269632 (232.00 GiB 249.11 GB)
Raid Devices : 8
Total Devices : 8
Persistence : Superblock is persistent
Update Time : Sun Jan 27 02:27:28 2013
State : clean
Active Devices : 8
Working Devices : 8
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 16K
Name : XXX:0 (local to host XXX)
UUID : da015f96:138b37bf:d5ef71dc:8970ab15
Events : 8
Number Major Minor RaidDevice State
0 8 49 0 active sync /dev/sdd1
1 8 65 1 active sync /dev/sde1
2 8 81 2 active sync /dev/sdf1
3 8 97 3 active sync /dev/sdg1
4 8 113 4 active sync /dev/sdh1
5 8 129 5 active sync /dev/sdi1
6 8 145 6 active sync /dev/sdj1
7 8 161 7 active sync /dev/sdk1
# cat /sys/block/md0/md/mismatch_cnt
362732152
This is with mdadm v3.2.6 (mdadm-3.2.6-7.fc18.x86_64); except for the
huge values of mismatch_cnt, I see no other indications for errors on
the disk drives, RAID arrays or the file systems on top of these.
Is this some known (and hopefully harmless), issue, or must I worry
about our data?
Thanks in advance.
Best regards,
Wolfgang Denk
--
DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@xxxxxxx
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most people's C programs should be indented six feet downward and
covered with dirt." - Blair P. Houghton
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