On Wed, Jul 23, 2008 at 02:07:32PM +0200, exxs.net - matevz sernc-urban wrote:
> Dear LVM-Users,
>
> 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).
>
> * WORKING STATE:
> server$ pvscan
> PV /dev/md2 VG mainvg lvm2 [909.59 GB / 299.59 GB free]
> Total: 1 [909.59 GB] / in use: 1 [909.59 GB] / in no VG: 0 [0 ]
>
> * NOT-WORKING STATE:
> server$ pvscan
> No matching physical volumes found
>
> notice: Same behaviour with vgscan and lvscan.
>
> Our Setup:
> * RAID-10 /dev/md2 on /dev/sd[a-d]5
> cat /proc/mdstat
> Personalities : [raid1] [raid10]
> md2 : active raid10 sdb5[1] sda5[0] sdd5[3] sdc5[2]
> 953778688 blocks 64K chunks 2 far-copies [4/4] [UUUU]
>
> * LVM2 on top of /dev/md2 (no separate lvm partition)
> lvm metadata backup is present and it is exactly the same as backups we
> did months ago
>
> I will attach the lvm2 metadata file to this message (vg name: mainvg)
>
> WORKING STATE:
> server$ pvscan -vv
> Setting global/locking_type to 1
> File-based locking selected.
> Setting global/locking_dir to /var/lock/lvm
> Locking /var/lock/lvm/P_global WB
> Wiping cache of LVM-capable devices
> /dev/sndstat: stat failed: No such file or directory
> Wiping internal VG cache
> Walking through all physical volumes
> /dev/md2: size is 1907557376 sectors
> /dev/md2: lvm2 label detected
> PV /dev/md2 VG mainvg lvm2 [909.59 GB / 299.59 GB free]
> Total: 1 [909.59 GB] / in use: 1 [909.59 GB] / in no VG: 0 [0 ]
> Unlocking /var/lock/lvm/P_global
>
> NOT-WORKING STATE:
> server$ pvscan -vv
> Setting global/locking_type to 1
> File-based locking selected.
> Setting global/locking_dir to /var/lock/lvm
> Locking /var/lock/lvm/P_global WB
> Wiping cache of LVM-capable devices
> /dev/sndstat: stat failed: No such file or directory
> Wiping internal VG cache
> Walking through all physical volumes
> /dev/md2: size is 1907557376 sectors
> /dev/md2: No label detected
> No matching physical volumes found
> Unlocking /var/lock/lvm/P_global
>
>
> 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
echo check > /sys/block/md2/md/sync_action
Lars
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