On 2/3/2011 1:09 PM, Digimer wrote:
On 02/03/2011 01:50 PM, J wrote:
If you use clustered LVM, snapshotting is not an option.
How you snapshot depends, to an extent, on where LVM is in relation to
your DRBD resource. That is, if it's raw partition -> DRBD -> LVM, raw
partition -> LVM -> DRBD or stacked raw -> LVM -> DRBD -> LVM.
If you've got LVM below DRBD, then snapshotting it would, I suspect,
take a point-in-time snapshot of one side of the resource. So long as
the DRBD itself is UpToDate, this should provide you with a "drive
image" capable of restoring your DRBD resource. Alternatively, if you
use LVM on DRBD, then you can snapshot individual LVM LVs as you
normally would.
In either case, you should not impact or effect your DRBD resource,
beyond allocating enough space for the snapshot partition (be it
node-side or space in the DRBD resource).
So, I believe the answer is no: I will not be able to mount that locally
and easily. Suppose remounting the file system read only for a fast
rsync is a viable fall back.
J
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