I have two small clusters configured with the same version of Ceph and the same OS version.
(different processor hardware)
On these clusters I have bootable RBD images that I expect a VM to boot from.
On one cluster, the VM does not boot from the image. On the other cluster, it boots fine.
On the failing cluster, a VM can boot fine from the base qcow2 image from which the rbd image was created. It's only rbd images that are causing problems for the VM.
I would like to enable some debug logging that could tell where the two clusters are diverging.
I tried adding
debug rbd = 20
log file = /tmp/cbt/ceph/log/$name.log
I do see some rbd debug messages to stderr during operations like rbd clone, etc. but I don't see any log files created in /tmp/cbt/ceph or /var/log/ceph or any messages when librbd is being used by say qemu-img convert, or by qemu-kvm.
Is there a way to see detailed debug messages for librbd?
Or is there a better way to see where things are diverging between these two clusters?
(note: I tried lttng but could not get it to record anything)
-- Tom
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