Hi!
I have been having issue with backup speed's after I upgraded my PVE cluster from v8 to v9.
I upgraded my PBS from v3 to v4 first and after that everything seemed to work OK, but for some reason after PVE cluster upgrade I noted that VM machines are ultimate slow. Speed is only KiB/s. I have tried to resolve this but cannot seem to find any reason. Below is example of output where it shows the issue.
If I cancel the backup jobs of the VM it is also left as locked and qemu guest agent crashes. When I then unlock the VM on the PVE cli, memory is instantly getting full utilisation and VM crashed.
Anyone else having similar issues? What could I try to resolve the issue?
I have been having issue with backup speed's after I upgraded my PVE cluster from v8 to v9.
I upgraded my PBS from v3 to v4 first and after that everything seemed to work OK, but for some reason after PVE cluster upgrade I noted that VM machines are ultimate slow. Speed is only KiB/s. I have tried to resolve this but cannot seem to find any reason. Below is example of output where it shows the issue.
If I cancel the backup jobs of the VM it is also left as locked and qemu guest agent crashes. When I then unlock the VM on the PVE cli, memory is instantly getting full utilisation and VM crashed.
Anyone else having similar issues? What could I try to resolve the issue?
Code:
INFO: starting new backup job: vzdump 111 --mode snapshot --remove 0 --notification-mode notification-system --notes-template '{{cluster}}, {{guestname}}, {{node}}, {{vmid}}' --storage pbs-backup --node pve4
INFO: Starting Backup of VM 111 (qemu)
INFO: Backup started at 2025-08-28 16:15:09
INFO: status = running
INFO: VM Name: #VMNAME WAS HERE#
INFO: include disk 'scsi0' 'local-btrfs:111/vm-111-disk-1.raw' 32G
INFO: include disk 'efidisk0' 'local-btrfs:111/vm-111-disk-0.raw' 528K
INFO: include disk 'tpmstate0' 'local-btrfs:111/vm-111-disk-2.raw' 4M
INFO: backup mode: snapshot
INFO: ionice priority: 7
INFO: creating Proxmox Backup Server archive 'vm/111/2025-08-28T13:15:09Z'
INFO: attaching TPM drive to QEMU for backup
INFO: issuing guest-agent 'fs-freeze' command
INFO: issuing guest-agent 'fs-thaw' command
INFO: started backup task '411ce17b-c122-40e9-8a14-ed082b1bef64'
INFO: resuming VM again
INFO: efidisk0: dirty-bitmap status: created new
INFO: scsi0: dirty-bitmap status: created new
INFO: tpmstate0-backup: dirty-bitmap status: created new
INFO: 0% (60.0 MiB of 32.0 GiB) in 3s, read: 20.0 MiB/s, write: 20.0 MiB/s
INFO: 1% (364.0 MiB of 32.0 GiB) in 5m 20s, read: 982.0 KiB/s, write: 982.0 KiB/s
INFO: 2% (668.0 MiB of 32.0 GiB) in 45m 23s, read: 129.5 KiB/s, write: 129.5 KiB/s
INFO: 3% (988.0 MiB of 32.0 GiB) in 2h 30m 31s, read: 51.9 KiB/s, write: 51.9 KiB/s