zstd Backup

[informant]

Hi a question about zstd backup. Why do zstd stop VM on backup start and resume for 1-3 seconds and other backups variants not? Is it normal? Or what is mean here? regards

INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: creating vzdump archive '/mnt/pve/A2F/dump/vzdump-qemu-100-2020_12_02-08_20_18.vma.zst'
INFO: started backup task 'be1a27d2-9273-4412-86e2-767c40fed512'
INFO: resuming VM again

 

[t.lamprecht]

Hi,

FYI: the comperssor setting (zstd, gzip, lzo) is not controlling the backup mode.

backup mode: snapshot

That's the actual mode you were using (docs: https://pve.proxmox.com/wiki/Backup_and_Restore#_backup_modes ).

INFO: resuming VM again

Resume means, resume after snapshot was made - depending on underlying storage and VM configuration there can be a short pause where the disks are all synced up to get a cleaner state for backup, but this is not stopping the VM, it should be more noticeable like a short (milliseconds) freeze.

 

[informant]

hi thanks for nice information. than i have wrong interpreted it. thanks for detailed infos.