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Can you help explain why a machine with a single virtual disk would benefit from virtio scsi single?

I'm spinning up a test VM right now to test this with and without qemu-guest-agent

mysqld Ver 10.3.34-MariaDB-0ubuntu0.20.04.1 for debian-linux-gnu on x86_64 (Ubuntu 20.04)

Looks like the Ubuntu repo.

I've changed some VMs to virtio scsi single, but not all. Maybe a project for next week.

Experiencing a similar issue on machines with Ubuntu 20 and MariaDB. Backups will lock up the machine.

Well, the switch to io_thread/async Threads did not mitigate the problem entirely. Machine lockups are still happening. Interesting note though. The worst of the issues comes when we are backing machines running CentOS. This may be entirely coincidental, but we seem to have issues any time...

The VMs are all configured with shared NFS storage. On 6.x, we had zero issues with our PBS (or even backup to another NFS share). It looks like the lockup issue is mostly mitigated with the switch to io_thread and async to threads. I had tried before I found this thread swapping the async to...

Testing the IO Thread/Virtio Single SCSI/Threads solution today. After we had upgraded our 5 node Cluster to 7.1 from 6, we noticed that backups on a VM living on Node 1 would start locking up a machine on Node 3. The only common thread was they shared network storage. The backup setup had...