[PVE-User] Problem Cloning Disk

[Lindsay Mathieson]

On Thu, 26 Mar 2015 01:18:26 PM you wrote:
> >> '/mnt/cephfs/images/201/vm-201-disk-1.qcow2',
> 
> why do you use qcow2 file on top of cephfs ??????????
> 
> you should use ceph as a block device through rbd.
> 
> (performance will be awfull with qcow2 on top of cephfs)


No, I have not found that at all.  Our benchmarks and usage tests bear this 
out.

And snapshot performqance on rbd  - live and restores is truly awful, orders 
of magnitude worse than qcow2. And we use them for development and testing a 
lot.


Which is beside the point - I had the same error trying to clone from rbd to 
rbd. Proxmox is not allocating a large enough image for the copy.