I've been chasing a ghost since upgrading to proxmox 8.3 (correlation is not causation, so I can't point to 8.3 just yet). Random LXC containers start to exhibit i/o errors. This is only "noticed" when a nightly backup runs as it then errors, but fails on those specific LXC's. The storage is local, on ZFS. ZFS scrub are clean, no checksum or i/o errors. The backup will tell me which file is giving the i/o error. If I go into the container and try to read the file, I get the same i/o error...
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