ERROR: PBS backups are not supported by the running QEMU version. Please make sure you've installed the latest version and the VM has been restarted.

[SOLTECSIS - Carles Munyoz]

I'm having the same problem ...

I have just updated to the latests Proxmox release and some of my virtual machines give this error when I try to backup them using PBS:
PBS backups are not supported by the running QEMU version. Please make sure you've installed the latest version and the VM has been restarted.

During the upgrade I migrated online the virtual machines to other nodes for avoid stoping them.
Should I stop and restart again these virtual machines for solve the problem?

 

[t.lamprecht]

Can you post the output of

pveversion -v
# replace VMID below with a relevant ID of a VM which should work
qm status VMID --verbose|grep -A5 proxmox-support

 

[SOLTECSIS - Carles Munyoz]

I have been testing the backup of the virtual machines with problems and now it is going fine.
Maybe the solution has come because I have had to stop and start them again?

 

[iBot]

Well, in in may case I deactivated the qemu agent inside the vm. Then it was working for one or two backups.
The next time the pbs backup got interrupted again and the vm again was not accessible !
Now I deactivated the qemu agent support in the vm configuration, now it seems that the backup is working.
I will wait until tomorrow.

There must be some relations between the pbs backup and the qemu agent (FS thawing) , that lead to this behaviour.

 

[t.lamprecht]

I have been testing the backup of the virtual machines with problems and now it is going fine.
Maybe the solution has come because I have had to stop and start them again?

Please, can you actually post the requested output so that we can try to actually help?

 

[SOLTECSIS - Carles Munyoz]

Yes, of course:

# pveversion -v
proxmox-ve: 6.3-1 (running kernel: 5.4.78-2-pve)
pve-manager: 6.3-3 (running version: 6.3-3/eee5f901)
pve-kernel-5.4: 6.3-3
pve-kernel-helper: 6.3-3
pve-kernel-5.3: 6.1-6
pve-kernel-5.4.78-2-pve: 5.4.78-2
pve-kernel-5.4.44-2-pve: 5.4.44-2
pve-kernel-5.3.18-3-pve: 5.3.18-3
pve-kernel-5.3.18-2-pve: 5.3.18-2
ceph: 14.2.16-pve1
ceph-fuse: 14.2.16-pve1
corosync: 3.0.4-pve1
criu: 3.11-3
glusterfs-client: 5.5-3
ifupdown: residual config
ifupdown2: 3.0.0-1+pve3
ksm-control-daemon: 1.3-1
libjs-extjs: 6.0.1-10
libknet1: 1.16-pve1
libproxmox-acme-perl: 1.0.7
libproxmox-backup-qemu0: 1.0.2-1
libpve-access-control: 6.1-3
libpve-apiclient-perl: 3.1-3
libpve-common-perl: 6.3-2
libpve-guest-common-perl: 3.1-3
libpve-http-server-perl: 3.1-1
libpve-storage-perl: 6.3-3
libqb0: 1.0.5-1
libspice-server1: 0.14.2-4~pve6+1
lvm2: 2.03.02-pve4
lxc-pve: 4.0.3-1
lxcfs: 4.0.3-pve3
novnc-pve: 1.1.0-1
proxmox-backup-client: 1.0.6-1
proxmox-mini-journalreader: 1.1-1
proxmox-widget-toolkit: 2.4-3
pve-cluster: 6.2-1
pve-container: 3.3-2
pve-docs: 6.3-1
pve-edk2-firmware: 2.20200531-1
pve-firewall: 4.1-3
pve-firmware: 3.1-3
pve-ha-manager: 3.1-1
pve-i18n: 2.2-2
pve-qemu-kvm: 5.1.0-7
pve-xtermjs: 4.7.0-3
qemu-server: 6.3-2
smartmontools: 7.1-pve2
spiceterm: 3.1-1
vncterm: 1.6-2
zfsutils-linux: 0.8.5-pve1

# qm status 112 --verbose|grep -A5 proxmox-support
proxmox-support:
    pbs-library-version: 1.0.2 (18d5b98ab1bec4004178a0db6f2debb83bfa9165)
    pbs-dirty-bitmap: 1
    pbs-dirty-bitmap-migration: 1
    query-bitmap-info: 1
qmpstatus: running