[ClusterLabs] convert already clustered LVM to cLVM
zren at suse.com
Sun Jul 2 23:45:59 EDT 2017
On Wed, Jun 28, 2017 at 08:46:55AM +0000, Cristiano Coltro wrote:
> Hi all,
> A brief History
> Customer of mine has setted up a SLES 11 sp3 and SLES11sp4 HA environment and he has some LVM as resources.
> When he tries to expand LVM for a "need of space" reason he wasn't able to extend cause a corruption of metadata that even if recovered with vgcfgrestore doesn't heal.
It's dangerous to have a non-clustered VG for shared disks. The
corruption will _not_ surprise me if the VG is on shared disks
which means that the disks have possibility to be attached to more than
one node in the cluster.
> The customer has not configured LVM with the "c"( clustered ) attribute
> 95 VG #PV #LV #SN Attr VSize VFree
> 96 vg00 1 3 0 wz--n- 279.22g 88.22g
> 97 vgWP4 2 10 0 wz--n- 49.97g 5.97g
> that prevents to extend the LVM and gets
> 83664 Setting global/locking_type to 3
> 83665 global/wait_for_locks not found in config: defaulting to 1
> 83666 Cluster locking selected.
> 83667 connect() failed on local socket: No such file or directory
> 83668 Internal cluster locking initialisation failed.
Please check if the clvmd daemon is running well, which is a must when
locking_type is 3.
> 83669 Setting global/fallback_to_local_locking to 1
> 83670 locking/fallback_to_local_locking not found in config: defaulting to 1
> 83671 WARNING: Falling back to local file-based locking
> Cause he has the file locking set to 3 ( correctly ) but he must have the "c" attribute to work properly.
> Coming to my question:
> * Is there a way to convert the LVMs without pain to cLVMs? I know that technically a vgchange -cy do the trick but I'm not sure which impacts it can have.
No, if a clustered VG is what you need. "vgchange -cy" will give the VG
cluster-wide protection, which is needed if the VG is shared among
nodes. It won't
break anything, but otherwise making a non-clustered VG on shared disks
is dangerous, because the metadata on the shared disk may be corrupted
unexpectedly from more than one nodes.
> Thanks in advance
> Cristiano Coltro
> Premium Support Engineer
> mail: cristiano.coltro at microfocus.com<mailto:cristiano.coltro at microfocus.com>
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