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Flamie
Tux's lil' helper
Joined: 29 Apr 2004
Posts: 106
Location: Gothenburg, Sweden
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 Posted: Thu Jan 27, 2005 3:43 pm Post subject: recovering faulty raid5 array |
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Hi, yesterday my array was working nicely using evms.
a reboot later things didn't work at all, 2 devices reported broken.
both of these devices works and get listed when I boot up (I can cfdisk them as well).
I read some on google and these forums, but my problem seem unique.
here is some information:
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roze root # mdadm -E /dev/hda
/dev/hda:
Magic : a92b4efc
Version : 00.90.00
UUID : 17772939:b659f8ec:f3d658e2:5a70ec8d
Creation Time : Wed Jan 26 08:19:04 2005
Raid Level : raid5
Device Size : 160086464 (152.67 GiB 163.93 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Thu Jan 27 12:52:33 2005
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 4
Spare Devices : 0
Checksum : 52c1b6fb - correct
Events : 0.83802
Layout : left-symmetric
Chunk Size : 32K
Number Major Minor RaidDevice State
this 0 3 0 0 active sync /dev/hda
0 0 3 0 0 active sync /dev/hda
1 1 3 64 1 active sync /dev/hdb
2 2 0 0 2 faulty removed
3 3 0 0 3 faulty removed
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now, I have not made any partitions, but instead raided the entire disks.
all four ones, a through d, was used for a raid5 array.
suddenly after a reboot hdc and hdd loose their superblocks.
if possible, I'd like to reset their superblocks and add them to the array again.
I've tried playing around with raidtools, evms and mdadm.
(now I've removed raidtools and evms, they cause too much trouble)
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mdadm --assemble -u 17772939:b659f8ec:f3d658e2:5a70ec8d -f /dev/md/0
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gives me a segfault.
I've tried compiling i with i386 as suggested in another thread as well as using the newer masked version.
can someone please tell me why the superblock disappeared so I can avoid that in the future, and how to restore my array from this state?
thanks in advance, Flamie |
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Flamie
Tux's lil' helper
Joined: 29 Apr 2004
Posts: 106
Location: Gothenburg, Sweden
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| Posted: Thu Jan 27, 2005 8:17 pm Post subject: |
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oki folks, I found a way to reconstruct the broken superblocks.
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# mkraid --force /dev/md/0
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make the array working again, however it is reconstructing the data in it as well, so I can't be sure it uses the right data, all seems to be hanging on whether or not I wrote the right stuff in raidtab (checked with mdadm for the info, so let's hope this works).
I will be back later today or tomorrow with the results. |
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Flamie
Tux's lil' helper
Joined: 29 Apr 2004
Posts: 106
Location: Gothenburg, Sweden
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| Posted: Fri Jan 28, 2005 8:26 am Post subject: |
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Turned out the entire array synced up with bad data.
I noticed in my dmesg that I have the DriveReady SeekComplete error I once had before.
all of my googling and forum reading suggests this is a problem with either the cables or disks, and I tested all my disks with smarttools and they are working.
could this also be a cause of a faulty ide-controller? kernel-bug? (just went back to plain gentoo-sources in case it is)
*sighs heavily*
just another day in my wonderful life... |
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