[pve-devel] LVM no snapshots?

[Alexandre DERUMIER]

>>Thanks, i just started to setup a small proxmox home server where i
>>don't have any storage server just disks in my systems and thought i
>>could use snapshots with lvm.

lvm snapshot have a big impact on performance, so they should be used temporary, like for backup.
Also when you remove the snapshot, you need to re-read and copy data from the snapshot to main lvm.

They are a new lvm snapshot format (using dm-thinp), which work fine. (thin reservation, using some kind of cow with metadatas,...)
But it's not working in a cluster for now.




----- Mail original ----- 

De: "Stefan Priebe" <s.priebe at profihost.ag> 
À: "Michael Rasmussen" <mir at datanom.net> 
Cc: pve-devel at pve.proxmox.com 
Envoyé: Mardi 6 Août 2013 19:55:35 
Objet: Re: [pve-devel] LVM no snapshots? 

Am 06.08.2013 19:48, schrieb Michael Rasmussen: 
> On Tue, 06 Aug 2013 19:39:48 +0200 
> Stefan Priebe <s.priebe at profihost.ag> wrote: 
> 
>> Hi, 
>> 
>> with Disks on LVM the snapshot option in PVE is greyed out. Is this correct? I thought PVE supports Snapshots on top of LVM. 
>> 
> Yes, no snapshots for LVM. Either the disk image format must support 
> snapshotting (qcow2) or the underlaying storage system must support it 
> (Nexenta, ceph, ZFS). Since LVM does not provide snapshots as well as 
> RAW disk image then snapshots on LVM is not supported. 

Thanks, i just started to setup a small proxmox home server where i 
don't have any storage server just disks in my systems and thought i 
could use snapshots with lvm. 

Stefan 
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