[ClusterLabs] snapshots in a clvm environment - some questions for proceeding
bernd.lentes at helmholtz-muenchen.de
Fri Feb 24 13:00:39 EST 2017
----- On Feb 24, 2017, at 6:24 PM, Bernd Lentes bernd.lentes at helmholtz-muenchen.de wrote:
> we have a two node cluster, our resources are several virtual machines running
> on kvm. The vm's reside in plain logical volumes, without a filesystem inside
> the lv's.
> The lv's reside on a SAN.
> I know that i can do a snapshot of a lv while having clvm when i acitivate it
> exclusively on one node. OK.
> I tried it via lvchange -aly. I got "lvchange Using logical volume(s) on command
> line. lvchange Activating logical volume "lv_cluster_01" locally". Seems to
> Then i'm able to take the snapshot. But what is when i'd like to activate the lv
> cluster-wide again ? Is the snapshot gone or corrupted ?
> I tried to activate it cluster-wide again with "lvchange -vay". Seems to work
> Because, if i leave it exclusively activated on one note, i loose my high
> availibilty. How can it migrate to the other host if it is exclusively
> activated ?
> How can i find out if a lv is activated exclusively ? How can i find out on
> which node it is activated exclusively ?
I read https://www.centos.org/docs/5/html/Cluster_Logical_Volume_Manager/cluster_activation.html .
It seems that a local activation is not an exclusiv one. Ok. I tried "lvchange -vaey" for that lv, but got:
lvchange Using logical volume(s) on command line
lvchange Activating logical volume "lv_cluster_01" exclusively
lvchange Error locking on node 40a86414: Device or resource busy
I shut down the guest, still the same message.
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