Hi everyone,
I mentioned[1] my trouble with the multipath detection code on the
Fedora rescue mode messing up my raid yesterday.
My raid6 partitions recovered fine, but the raid10 device (/
sd[abc...k]5) somehow got messed up.
When I assemble the drive it says all 9 drives and 2 spares are ok/
clean and the event counter is the same for each drive. The volume
group on the device is detected/started ok - but maybe that's just
from the /etc/lvm/backup file?
However, fsck.ext3 (with or without specifying the alternate
superblock) can't see the file systems in the logical volumes.
I suspect that maybe the layout of the md device got messed up? How
can I find out if that's the case? Would it be possible to recover
from (assuming all the data still is on some of the disks).
Secondary question: I'm doing a "dd if=/dev/sdX5 bs=256k > /backup/
sdX5" for each disk -- is there a way to run mdadm on the copies and
experiment on those? (It took ~forever to copy a terabyte of the
raw partitions).
Any help is greatly appreciated.
As a sidenote: I guess I learned my lesson about having an odd number
of drives in a raid10 too (if I understand it correctly then it
roughly doubles the chance that a secondary problem ruins the day).
- ask
[1] http://marc.info/?l=linux-raid&m=120065542429935&w=2
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