Sounds familiar... and discussed in "disk timeouts in libvirt/qemu VMs..."
We have not had this issue since reverting exclusive-lock, but it was suggested this was not the issue. So far it's held up for us with not a single corrupt filesystem since then.
On some images (ones created post-Jewel upgrade) the feature could not be disabled, but these don't seem to be affected. Of course, we never did pinpoint the cause of timeouts, so it's entirely possible something else was causing it but no other major changes went into effect.
One thing to look for that might confirm the same issue are timeouts in the guest VM. Most OS kernel will report a hung task in conjunction with the hang up/lock/corruption. Wondering if you're seeing that too.
On Wed, May 3, 2017 at 10:49 PM, Stefan Priebe - Profihost AG <s.priebe@xxxxxxxxxxxx> wrote:
Hello,
since we've upgraded from hammer to jewel 10.2.7 and enabled
exclusive-lock,object-map,fast-diff we've problems with corrupting VM
filesystems.
Sometimes the VMs are just crashing with FS errors and a restart can
solve the problem. Sometimes the whole VM is not even bootable and we
need to import a backup.
All of them have the same problem that you can't revert to an older
snapshot. The rbd command just hangs at 99% forever.
Is this a known issue - anythink we can check?
Greets,
Stefan
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Brian Andrus | Cloud Systems Engineer | DreamHost
brian.andrus@xxxxxxxxxxxxx | www.dreamhost.com
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