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xen-users
RE: [Xen-users] High Number of VMs
> You don't actually need cLVM to do this! All the
> cluster infra does (for its nasty administrative overhead) is keep the
> LVM metadata (not your actual data) consistent through cluster-wide
> locks. You can manage yourself by, for example, making changes on one
> node and refreshing the other nodes with things like 'vgscan -ay'. I
> typically allocate LUNs 500GB at a time. You can invent means of
> keeping things consistent that work for your environment, just test them
> first.
Another thing cLVM does is enforce the restriction on snapshots. Without cLVM
you could create a snapshot on one node and completely trash the volume. I
believe the CoW action of LVM snapshots involves a metadata update so you can't
use it in a clustered environment. This is why I use LVM on the SAN rather than
on the DomU.
James
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