[PVE-User] ceph/rbd to qcow2 - sparse file

Lindsay Mathieson lindsay.mathieson at gmail.com
Fri Oct 23 01:58:54 CEST 2015

On 20 October 2015 at 06:30, Fabrizio Cuseo <f.cuseo at panservice.it> wrote:

> Moving from rbd to qcow2 caused all the disks to loose the sparse mode.

This has been a problem for ages, I've brought it up in the past. It makes
for incredibly slow and inefficient disk transfers when moving VM's large
disks , even if they have only small amounts of data. Every zero gets
transferred. Backups seem to be affected as well.

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