Re: [Xen-users] xen storage options - plase advise

[John Madden <jmadden@xxxxxxxxxxx>]

> i suggest you to use LVM and NOT CLVM. CLVM does not support
> snapshotting at all.
CLVM itself doesn't allow snapshotting, but you can still run snapshots 
from within your domU's.
But keep in mind that running a snapshot from dom0 with a LV that is 
phy: exported to your domU won't provide a consistent snapshot anyway, 
so I don't see the point in snapshotting from dom0.  (domU maintains its 
own buffer cache, has no idea that a snapshot has been created from 
dom0; dom0 has no idea what domU is doing, can only see the blocks that 
have been committed to disk, which is not necessarily consistent.  This 
is roughly equivalent to creating a snapshot on your SAN without first 
syncing the client.)
Use CLVM.  If you need snapshots, do them within the domU.

John




--
John Madden
Sr UNIX Systems Engineer
Ivy Tech Community College of Indiana
jmadden@xxxxxxxxxxx

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