[linux-lvm] LVM snapshot with Clustered VG

[Vladislav Bogdanov]

04.01.2013 05:56, Rob wrote:
> Is there a way to convert an active LV on a clustered VG to an exclusive
> lock without deactivating it first? Or some way of taking a snapshot of
> a clustered LVM? I know I have read snapshots are not possible on CLVM,
> but the information seems outdated.
> 
> ha node1: /dev/vg_clus/logvol_clus
> ha node2: /dev/vg_clus/logvol_clus
> 
> 1) I can deactivate the the entire vg on node1 and node2 with 'vgchange
> -an vg_clus' and activate with -ay. Just stating cluster vg is working.
> 
> 2) I can deactivate locally on node2 with 'vgchange -aln vg_clus' , it
> shows inactive on node2 and active still on node1
>     - After deactivating, I cannot get exclusive lock on node1 with
> 'vgchange -aey vg_clus'
>       I get an error locking on node1
> 
> 3) I can get exclusive an lock if I deactivate the VG on both nodes and
> then run 'vgchange -aey vg_clus' on either node. The lvcreate snapshop
> works, but again, it requires deactivating the vg, which isn't an option
> in production.

You may try (experimental, not-complete) patch attached.

> 
> 
> Setup:
>  Centos 6.3 (current)
>  cman+pacemaker dual primary drbd for HA KVM w/ live migration
>  disk: lvm -> drbd -> clvm -> kvm virt
> 
> Currently I am taking a lvm snapshot of the drbd lvm backing device, but
> it's not ideal ( as there are other issues )
> 
> Thanks for the time!
> 
> -Rob
> 
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