[pve-devel] Snapshot questions

Philipp Marek philipp.marek at linbit.com
Mon Sep 7 10:58:29 CEST 2015


> > > Above container management toolkit 'pct' already supports drbd, and it would
> > > be really cool to have snapshots, so that we can make snapshot and 
> > > snapshot backups ;-)
> > The same should be easily possible for KVM, too.
> 
> Yes, but we do not need that for KVM backup purposes, because we have 
> a better method with KVM.
May I ask which one?


> We do not want to modify the snapshot. We only want read-only access.
Oh, okay.


> > > We can extend the storage API with 'activate_snapshot_volume()' and 
> > > 'deactivate_snapshot_volume()' if required?
> > Well, perhaps.
> > 
> > Would that make the snapshot itself available for access? 
> 
> there must be a way toö access snapshot data -  else we cannot 
> (obviously) make a snapshot backup. It is up to the storage driver to
> implement that.
> 
> > What if the 
> > snapshot data is accessible only on another node and not on the current 
> > one?
> 
> Well, the storage driver needs to solve that problem...
Okay, so we might need the activate_snapshot_volume() and 
deactivate_snapshot_volume() calls, to make the snapshot data available on 
the node calling the function.


Thanks for the quick answers!


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