Hello -
I'm currently stuck in a moderately awkward predicament. I have a 28 disk
software RAID5; at the time I created it I was using EVMS - this was because
mdadm 1.x didn't support superblock v1 and mdadm 2.x wouldn't compile on my
system. Everything was working great; until I had an unusual kernel error:
Jun 20 02:55:07 abyss last message repeated 33 times
Jun 20 02:55:07 abyss kernel: KERNEL: assertion (flags & MSG_PEEK) failed at
net/ 59A9F3C
Jun 20 02:55:07 abyss kernel: KERNEL: assertion (flags & MSG_PEEK) failed at
net/ipv4/tcp.c (1294)
I used to get this error randomly; a reboot would resolve it - the final fix
was to update the kernel. The reason I even noticed the error this time, was
because I was attempting to access my RAID, and some of the data wouldn't
come up. I did a cat /proc/mdstat and it said 13 of the 28 devices were
failed. I checked /var/log/kernel and the above message was spamming the log
repeatedly.
Upon reboot, I fired up EVMSGui to remount the raid - and I received the
following error messages:
Jul 14 20:17:46 abyss _3_ Engine: engine_ioctl_object: ioctl to object
md/md0 failed with error code 19: No such device
Jul 14 20:17:47 abyss _3_ MDRaid5RegMgr: md_analyze_volume: Object sda is
out of date.
Jul 14 20:17:47 abyss _3_ MDRaid5RegMgr: md_analyze_volume: Object sdb is
out of date.
Jul 14 20:17:47 abyss _3_ MDRaid5RegMgr: md_analyze_volume: Object sdc is
out of date.
Jul 14 20:17:47 abyss _3_ MDRaid5RegMgr: md_analyze_volume: Object sdd is
out of date.
Jul 14 20:17:47 abyss _3_ MDRaid5RegMgr: md_analyze_volume: Object sde is
out of date.
Jul 14 20:17:47 abyss _3_ MDRaid5RegMgr: md_analyze_volume: Object sdf is
out of date.
Jul 14 20:17:47 abyss _3_ MDRaid5RegMgr: md_analyze_volume: Object sdg is
out of date.
Jul 14 20:17:47 abyss _3_ MDRaid5RegMgr: md_analyze_volume: Object sdh is
out of date.
Jul 14 20:17:47 abyss _3_ MDRaid5RegMgr: md_analyze_volume: Object sdi is
out of date.
Jul 14 20:17:47 abyss _3_ MDRaid5RegMgr: md_analyze_volume: Object sdj is
out of date.
Jul 14 20:17:47 abyss _3_ MDRaid5RegMgr: md_analyze_volume: Object sdk is
out of date.
Jul 14 20:17:47 abyss _3_ MDRaid5RegMgr: md_analyze_volume: Object sdl is
out of date.
Jul 14 20:17:47 abyss _3_ MDRaid5RegMgr: md_analyze_volume: Object sdm is
out of date.
Jul 14 20:17:47 abyss _3_ MDRaid5RegMgr: md_analyze_volume: Found 13 stale
objects in region md/md0.
Jul 14 20:17:47 abyss _0_ MDRaid5RegMgr: sb1_analyze_sb: MD region md/md0 is
corrupt
Jul 14 20:17:47 abyss _3_ MDRaid5RegMgr: md_fix_dev_major_minor: MD region
md/md0 is corrupt.
Jul 14 20:17:47 abyss _0_ Engine: plugin_user_message: Message is:
MDRaid5RegMgr: Region md/md0 : MD superblocks found in object(s) [sda sdb
sdc sdd sde sdf sdg sdh sdi sdj sdk sdl sdm ] are not valid. [sda sdb sdc
sdd sde sdf sdg sdh sdi sdj sdk sdl sdm ] will not be activated and should
be removed from the region.
Jul 14 20:17:47 abyss _0_ Engine: plugin_user_message: Message is:
MDRaid5RegMgr: RAID5 region md/md0 is corrupt. The number of raid disks for
a full functional array is 28. The number of active disks is 15.
Jul 14 20:17:47 abyss _2_ MDRaid5RegMgr: raid5_read: MD Object md/md0 is
corrupt, data is suspect
Jul 14 20:17:47 abyss _2_ MDRaid5RegMgr: raid5_read: MD Object md/md0 is
corrupt, data is suspect
I realize this is not the EVMS mailing list; I tried earlier (I've been
swamped at work) with no success on resolving this issue there. Today, I
tried mdadm 2.0-devel-2. It compiled w/o issue. I did a mdadm --misc -Q
/dev/sdm.
-(root@abyss)-(~/mdadm-2.0-devel-2)- # ./mdadm --misc -Q /dev/sdm
/dev/sdm: is not an md array
/dev/sdm: device 134639616 in 28 device undetected raid5 md-1. Use
mdadm --examine for more detail.
-(root@abyss)-(~/mdadm-2.0-devel-2)- # ./mdadm --misc -E /dev/sdm
/dev/sdm:
Magic : a92b4efc
Version : 01.00
Array UUID : 4e2b6b0a8e:92e91c0c:018a4bf0:9bb74d
Name : md/md0
Creation Time : Wed Dec 31 19:00:00 1969
Raid Level : raid5
Raid Devices : 28
Device Size : 143374592 (68.37 GiB 73.41 GB)
Super Offset : 143374632 sectors
State : clean
Device UUID : 4e2b6b0a8e:92e91c0c:018a4bf0:9bb74d
Update Time : Sun Jun 19 14:49:52 2005
Checksum : 296bf133 - correct
Events : 172758
Layout : left-asymmetric
Chunk Size : 128K
Array State : uuuuuuuuuuuuUuuuuuuuuuuuuuuu
After which, I checked on /dev/sdn.
-(root@abyss)-(~/mdadm-2.0-devel-2)- # ./mdadm --misc -Q /dev/sdn
/dev/sdn: is not an md array
/dev/sdn: device 134639616 in 28 device undetected raid5 md-1. Use
mdadm --examine for more detail.
-(root@abyss)-(~/mdadm-2.0-devel-2)- # ./mdadm --misc -E /dev/sdn
/dev/sdn:
Magic : a92b4efc
Version : 01.00
Array UUID : 4e2b6b0a8e:92e91c0c:018a4bf0:9bb74d
Name : md/md0
Creation Time : Wed Dec 31 19:00:00 1969
Raid Level : raid5
Raid Devices : 28
Device Size : 143374592 (68.37 GiB 73.41 GB)
Super Offset : 143374632 sectors
State : active
Device UUID : 4e2b6b0a8e:92e91c0c:018a4bf0:9bb74d
Update Time : Sun Jun 19 14:49:57 2005
Checksum : 857961c1 - correct
Events : 172759
Layout : left-asymmetric
Chunk Size : 128K
Array State : uuuuuuuuuuuuuUuuuuuuuuuuuuuu
It looks like the first 'segment of discs' sda->sdm are all marked clean;
while sdn->sdab are marked active.
What can I do to resolve this issue? Any assistance would be greatly
appreciated.
-- David M. Strang
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