[PVE-User] Unresponsive VM(s) during VZdump

[Fiona Ebner]

Am 09.05.24 um 13:24 schrieb Alexander Burke:
> Hello all,
> 
> My understanding is that if the backing store is ZFS, a snapshot of the zvol underlying the guest's disk(s) is instant and atomic, and the snapshot is what gets backed up so fleecing is moot. Am I wrong on this?
> 

The snapshot-level backup in Proxmox VE is not done on the storage
layer, but in the QEMU block layer. That makes it independent of
whether/how the underlying storage supports snapshots and allows for
dirty tracking for incremental backup. See here for further
information/discussion why it's not done on the storage layer:

https://pve.proxmox.com/pve-docs/chapter-vzdump.html#_vm_backup_fleecing
https://bugzilla.proxmox.com/show_bug.cgi?id=3233#c19

Best Regards,
Fiona