On 24/02/17 06:27 PM, Lentes, Bernd wrote: > > > ----- On Feb 24, 2017, at 7:20 PM, Digimer li...@alteeve.ca wrote: > > >>> >>> 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. >>> >>> Bernd > >> >> In my experience, you had to inactivate the LVs on both nodes, then >> re-activate as exclusive on the one node before you could do snapshots. >> This required powering off the guest server. >> > > I did it and it worked. > >> Aside from this, I strongly recommend against snapshots as a backup >> mechanism anyway. There is no way to ensure that that operating system >> and applications are in a clean state when you take the snapshot, so >> using the image is like recovering from sudden power loss. If data was >> in cache but not flushed out, you could have corruption. > > I don't want the snapshot for backup, but create it before configuration > changes in the vm. > Or installing some software. To revert if s.th. goes wrong. > >> If you can't stop your VMs, I'd recommend using a backup applicationĂź >> inside the VM that knows how to ensure that your apps and the OS are in >> a clean state, particularly for DBs. > > DB's are backuped totally indepently from the snapshotting with their > respective tools > like mysqldump or pg_dump. > > lvs or lvscan shows which lv's are active and which not. > > But what is when i want to have my vm high available again ? > For that all lv's must be active. So snapshot and vm high available is an > exclusiv or (exor) ? > > Bernd
Effectively, yes, they are exclusive. -- Digimer Papers and Projects: https://alteeve.com/w/ "I am, somehow, less interested in the weight and convolutions of Einstein’s brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops." - Stephen Jay Gould _______________________________________________ Users mailing list: Users@clusterlabs.org http://lists.clusterlabs.org/mailman/listinfo/users Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org