On Fri, Apr 15, 2022 at 16:58:08 +0200, Valentijn Sessink wrote:
Hi list,
I'm trying to migrate a few qemu virtual machines between two 1G ethernet
connected hosts, with local storage only. I got endless "error: operation
failed: migration of disk vda failed: Input/output error" errors and
thought: something wrong with settings.
However, then, suddenly: I succeeded without changing anything. And, hey:
while ! time virsh migrate --live --persistent --undefinesource
--copy-storage-all ubuntu20.04 qemu+ssh://duikboot/system; do a=$(( $a + 1
)); echo $a; done
... retried 8 times, but then: success. This smells like a race condition,
doesn't it? A bit weird is the fact that the migration seems to succeed
every time while copying from revolving disks to SSD; but the other way
around has this Input/output error.
There are some messages in /var/log/syslog, but not at the time of the
failure, and no disk errors. These disks are LVM2 volumes and they live on
raid arrays - and/so there is not a real, as in physical, I/O-error.
Source system has SSD's, target system has regular disks.
1) is this the right mailing list? I'm not 100% sure.
2) how can I research this further? Spending hours on a "while / then" loop
to try and retry live migration looks like a dull job for my poor computers
;-)
It would be helpful if you provide the VM XML file to see how your disks
are configured and the debug log file when the bug reproduces:
https://www.libvirt.org/kbase/debuglogs.html#less-verbose-logging-for-qem...
Without that my only hunch would be that you ran out of disk space on
the destination which caused the I/O error.