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-   -   clustered snapshots status, LVM on shared storage without CLVM? (http://www.linux-archive.org/device-mapper-development/495466-clustered-snapshots-status-lvm-shared-storage-without-clvm.html)

Jonathan Brassow 02-28-2011 08:49 PM

clustered snapshots status, LVM on shared storage without CLVM?
 
A true active/active cluster snapshot is not currently planned. There
is some discussion from time to time about whether it is appropriate
or not, but even this is idle chatter until the new (single-machine)
shared snapshot implementation is completed.


However, you will be able to take snapshots in a cluster in the next
RHEL releases (or if you use upstream sources) if the volume you are
snapshotting is activated exclusively.


It is possible to use LVM in a cluster without CLVM. I don't think it
would be smart though. You are essentially trying to do clvmd's job.
Do you know everything that it does? Are you sure you won't ever make
a mistake?


brassow

On Feb 28, 2011, at 3:28 PM, Nikola Ciprich wrote:


Hello,
I'd like to ask, what is the current status of cluster locking
patches?

I'm especially interested in clustered snapshots, is there some
estimate on when I could be suitable for testing and possibly
closer to production?
I'd like to use DMLoop on my clustered storage (as well as snapshots
in general), but with CLVM it's not really possible.
If the time is not close yet, my second question is - is it
dangerous to use LVM on top of shared storage without using CLVM?
If I'll take care to not run lvm commands from more then one node?
I'll be gratefull for any reply from more more experienced users
in this area.
thanks a lot in advance!
with best regards
nik


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