[sheepdog-users] About vdi restore

[MORITA Kazutaka]

At Mon, 3 Jun 2013 12:38:43 +0200,
Valerio Pachera wrote:
> 
> > 2) the images created by vdi backup, are already compressed?
> > I noticed that the images size is smaller than the amount data I've
> > been writing between snapshots.
> 
> Note: I've been writing file by dd if=/dev/zero.

The backup data is not compressed.  What collie does is only comparing
two VDIs and write a differential data to the backup file.

The reason you got a small backup file is that you overwrote the VDI
with /dev/zero and the contents were not changed.

Thanks,

Kazutaka