[PVE-User] Info on qcow2 clone

Alessandro Briosi ab1 at metalit.com
Wed Oct 22 19:15:19 CEST 2014

Il 22/10/2014 19:04, Alessandro Briosi ha scritto:
> Though I'm surprised that cloning the VM through proxmox the disk is not
> sparse and is using the whole 33G. So the question was if it's a known
> behaviour (maybe it's because of NFS and other filesystems which might
> create trouble with sparse files)
> If I do a backup and then a restore the restored file uses same space as
> the copied VM
> 4.5G -rw-r--r-- 1 root root 33G Oct 22 19:02 vm-101-disk-1.qcow2

Have done some other tests and the result was:

Doing a clone while a VM is running creates a 33G qcow2 file

Doing the clone while the VM is off creates a 4.5G qcow2 file

Backup and restore makes no difference: snapshot,stop or suspend always 
generate a 4.5G qcow2 file


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