On Tue, Jun 24, 2025 at 11:19 PM Gary Molenkamp <molen...@uwo.ca> wrote:
>
> We use ceph rbd as a volume service for both an Openstack deployment and
> a series of Proxmox servers. This ceph deployment started as a Hammer
> release and has been upgraded over the years to where it is now running
> Quincy. It has been fairly solid over that time, even
> through upgrades from filestore to bluestore, and many transparent
> hardware replacements/improvements.
>
> One concern we have is that when we have a hypervisor that unexpectedly
> dies/crashes, the volumes must always have the object maps rebuilt. If
> we don't rebuild the object maps, the VMs will either not boot, or we
> will have other side-effects that render the volume unusable. (ie cannot
> mount root). Is this to be expected during this type of event or have
> I missed a setting during one of the many upgrade on our deployment?
Hi Gary,
It's definitely not expected. Have you ever run "rbd object-map check"
command and captured its output before rebuilding the object map? Some
object map inconsistencies following a hard crash are expected, but they
shouldn't be leading to the VM not booting/rootfs not mounting.
Thanks,
Ilya
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