[SOLVED] proxmox-backup-client restore disk size

[mdub77]

Hi,

If in PBS I backed up a VM which has a disk of 500Gb of which only 200 is used (the disk was created with the discard option), and then I use from PVE the command

proxmox-backup-client restore

to restore the single disk.

Would it copy a full 500Gb disk or just a 200Gb one?

 

[fabian]

the restored output should be an identical copy of the backed up disk, so it will of course be 500GB in size (with lots of holes/zeroes )

 

[mdub77]

the restored output should be an identical copy of the backed up disk, so it will of course be 500GB in size (with lots of holes/zeroes )

So it would take the same time to restore as if it was a fully used 500Gb disk ?

 

[fabian]

no, since the empty part doesn't need to be really transferred from the backup server (and depending on the restore target, might not actually be "written" either).

 

[mdub77]

I'm using the command

proxmox-backup-client restore

to output the disk to a .raw file (I didn't find how to restore directly to a zvol since I'm on a ZFS pool and the original disk was a zvol). In that case, it should only write a 200G raw file, correct?

 

[fabian]

like I said - the file will have a logical size of 500GB, but only 200GB of data. whether the space usage is 500GB (full/thick) or 200GB (sparse/thin/..) depends on the storage/filesystem/.. . on ZFS, if you don't have compression disabled, any all-zero records will not take up any space, no matter how they are written.