[pve-devel] qcow2 on block devices

Alexandre DERUMIER aderumier at odiso.com
Sat Aug 25 14:06:46 CEST 2012


Oh ok, I didn't see it was for an lvm volume.

what do you mean by 
"How much free space should we provide? "

also is it possible to extend an lvm volume formated with qcow2 ?

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

De: "Dietmar Maurer" <dietmar at proxmox.com> 
À: "Alexandre DERUMIER" <aderumier at odiso.com> 
Cc: pve-devel at pve.proxmox.com 
Envoyé: Vendredi 24 Août 2012 17:45:59 
Objet: RE: qcow2 on block devices 

> Subject: Re: qcow2 on block devices 
> 
> I don't understand, what does it do ? 

It formats an LVM volume with qcow2. So you can basically use an 
lvm volume and create snapshots on it. 

somehow cool - but I am not sure if its usable. 
How much free space should we provide? 

> 
> ----- Mail original ----- 
> 
> De: "Dietmar Maurer" <dietmar at proxmox.com> 
> À: "Alexandre DERUMIER (aderumier at odiso.com)" 
> <aderumier at odiso.com>, pve-devel at pve.proxmox.com 
> Envoyé: Vendredi 24 Août 2012 12:09:00 
> Objet: qcow2 on block devices 
> 
> 
> 
> Wow, just detected a new feature ;-) 
> 
> # qemu-img info /dev/pve/vm-100-disk-1 
> image: /dev/pve/vm-100-disk-1 
> file format: raw 
> virtual size: 1.0G (1073741824 bytes) 
> disk size: 0 
> 
> # qemu-img create -f qcow2 /dev/pve/vm-100-disk-1 1G Formatting 
> '/dev/pve/vm-100-disk-1', fmt=qcow2 size=1073741824 encryption=off 
> cluster_size=65536 
> 
> # qemu-img info /dev/pve/vm-100-disk-1 
> image: /dev/pve/vm-100-disk-1 
> file format: qcow2 
> virtual size: 1.0G (1073741824 bytes) 
> disk size: 0 
> cluster_size: 65536 
> 
> # stat -L /dev/pve/vm-100-disk-1 
> File: `/dev/pve/vm-100-disk-1' 
> Size: 0 Blocks: 0 IO Block: 4096 block special file 
> 
> 
> So how can we use that? 



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