On Fri, Jan 29, 2021 at 9:34 AM Adam Boyhan <ad...@medent.com> wrote:
>
> This is a odd one. I don't hit it all the time so I don't think its expected 
> behavior.
>
> Sometimes I have no issues enabling rbd-mirror snapshot mode on a rbd when 
> its in use by a KVM VM. Other times I hit the following error, the only way I 
> can get around it is to power down the KVM VM.
>
> root@Ccscephtest1:~# rbd mirror image enable CephTestPool1/vm-101-disk-0 
> snapshot
> 2021-01-29T09:29:07.875-0500 7f1e99ffb700 -1 
> librbd::mirror::snapshot::CreatePrimaryRequest: 0x7f1e7c012440 
> handle_create_snapshot: failed to create mirror snapshot: (22) Invalid 
> argument
> 2021-01-29T09:29:07.875-0500 7f1e99ffb700 -1 librbd::mirror::EnableRequest: 
> 0x5597667fd200 handle_create_primary_snapshot: failed to create initial 
> primary snapshot: (22) Invalid argument
> 2021-01-29T09:29:07.875-0500 7f1ea559f3c0 -1 librbd::api::Mirror: 
> image_enable: cannot enable mirroring: (22) Invalid argument

I suspect that you have the exclusive-lock feature enabled and the
QEMU hypervisor host has a pre-octopus version of librbd.

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-- 
Jason
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