On Mon, Jan 10, 2011 at 12:51 PM, J. Ryan Earl <[email protected]> wrote:
> On Thu, Jan 6, 2011 at 1:23 PM, J <[email protected]> wrote: > >> In a related question. Is it possible to take a snapshot of the secondary >> volume while the drbd is active? I can't find the exact link, but the user's >> guide mentioned not accessing the secondary AT ALL while the primary was >> active. I assumed that would include taking snapshots of the secondary? > > > A DRBD device in secondary mode will not be accessible in anyway. IIRC, > the /dev/drbdX device won't even exist at this point. If you're using > protocol C and have the DRBD resource on top of LV, you can still snapshot > it and the snapshot should be consistent for a point-in-time. > > -JR > I should say, you can still snapshot it on [the secondary node at the time]... Otherwise, if you're running active-passive with LVM on-top of DRBD, then the snapshot can only be instigated by the primary and the snapshot CoW volume will be replicated to the secondary. Keep in mind, DRBD + Snapshotting will impose triple overhead on writes. -JR
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