[PVE-User] Backup Failing sporadically due to "PBS backups are not supported by the running QEMU version"

[Fabian Grünbichler]

On February 19, 2021 7:20 am, storm wrote:
> so the last backup during last night failed again with the same error on 
> the same node with pve-qemu-kvm 5.1.0-8 on which the backup was working 
> yesterday
> 
> any ideas?

just to confirm, can you do the following right after a backup fails, 
and then again after you got the VM back into a working state? 123 
should be replaced with the correct VMID..

perl -e 'use strict; use warnings; use PVE::QemuServer::Monitor; use Data::Dumper; $Data::Dumper::Sortkeys=1; print Dumper(PVE::QemuServer::Monitor::qmp_cmd(123, { "execute" => "query-proxmox-support" })), "\n";'

it issues exactly the QMP command that queries the running VM for 
proxmox-related features. it should return right away with output like 
this:

$VAR1 = {
          'pbs-dirty-bitmap' => bless( do{\(my $o = 1)}, 'JSON::PP::Boolean' ),
          'pbs-dirty-bitmap-migration' => $VAR1->{'pbs-dirty-bitmap'},
          'pbs-library-version' => '1.0.2 (0723f448fdad1fcf84ec7ae7d702baba11cb06d1)',
          'query-bitmap-info' => $VAR1->{'pbs-dirty-bitmap'}
        };

(the commit hash will be different)

or with some error message.