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Will do my best as soon as I get a chance and report back

@fweber I've manage to dedicate 1 node with mitigations=on and single client RDS server (who is working free of charge and should not complaint to much) So, I'm ready to test new kernel with patch if you provide such Right now numa balancing has been switched off and RDS server works smoothly...

Thanks a lot! Just some highlights that drove me crazy if disabling numa balancing is completely legitimate solution shouldn't it be disabled by default?

Then check this thread and links to virtio driver git (there are some advices from devs) If you are able to reproduce this issue easily it would be very helpful to find a solution or workaround

@roms2000 have you checked syslog after reboot? Is there anything related to ID 129 in windows syslog?

I performed some tests on my cluster and can confirm that tuning vzdump.conf could be used as workaround max average throughput of my 5 nodes cluster (with CEPH) = ~800MiB/s and PBS storage = ~300MiB/s 1) I set vzdump.conf as following: bwlimit: 150000 ionice: 8 2) On PBS I limited input...

However with ionice=8 set in vzdump.conf I can see it in backup log INFO: starting new backup job: vzdump --exclude 101,100,103 --notes-template '{{guestname}}' --storage PBS --mode snapshot --mailto ... --all 1 --mailnotification failure --node 063-pve-04446 INFO: Starting Backup of VM 6302...

PVE and virtio devs are already aware of this problem and I hope they will find out what goes wrong and fix it asap

What do mean by "such high values"? Defaults are: 2Mb with 60s timeout, tuned: 256Kb with 90s timeout You are free to test just one of them anyway

I will try the following: tune virtio-scsi driver settings via windows registry set ionice=8 in vzdump.conf on all nodes in cluster

Totally agree. Serializing backup jobs by PVE would be very useful indeed

Have you tried tuning virtio-scsi parameters as advised by virtio devs? HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\vioscsi\Parameters\Device IoTimeoutValue = 0x5a (90) HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\vioscsi\Parameters\Device PhysicalBreaks = 0x3f (63)

1) It died silently. It was not even possible to log in via console (it was no freezed but there were no services avalible) 2) Let me make it clear. PBS respects bwlimit parameter in vdump.conf? In other words: if I set bwlimit in vdump.conf PBS client will limit backup speed? Am I correct...

@fiona Is there any way to limit read/write bandwidth of PBS client (something like bwlimit in vdump.conf) ? there is a suggestion from virtio devs: How should I change my Vm config to incorporate this tune? P.S. there is another thread...

In my case switching to threads does not help(