Lars Ellenberg schrieb:
On Wed, Jul 23, 2008 at 02:07:32PM +0200, exxs.net - matevz sernc-urban wrote:
i am running into a very interesting situation today, that our LVM
metadata is recognized only sometimes. LVM was running fine for some
weeks and now from today on running pvscan 10 times one after another i
get about 4 positive and 6 negative results (its somehow a coincidence
that LVM is recognized).
...
Any hints?
Where should it look regarding "/dev/md2: No label detected" vs.
"/dev/md2: lvm2 label detected"??
It seems like RAID-10 is not sync'ed well maybe? But, mdstat reports all
disks are up.
just a shot in the dark:
for dev in /dev/sd{a,b,c,d}5; do
md5=$(dd if=$dev iflag=direct bs=1M count=1 | md5sum)
echo "$dev: $md5"
done
this is a RAID 10,f2 (with 2 far copies)
so the starting order of blocks is different on all 4 hdd's (and
therefore all four md5's are different).
echo check > /sys/block/md2/md/sync_action
i did this, and it finished without any failures - all disks are up and
sync'ed again. RAID is therefore not a possible problem.
i must add that the logical volumes are in use and working. i just
really do not want to reboot the machine as i suppose they couldn't be
brought up again.
Any other hints of why sometimes i get "/dev/md2: No label detected" vs.
"/dev/md2: lvm2 label detected"?
thanks in advance for any possible hints
mat
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