Hi,

We want to enable the hammer rbd features on newly created Cinder
volumes [1], but we still have a few VMs running with super old librbd
running (dumpling).

Perhaps its academic, but does anyone know the expected behaviour if
an old dumpling-linked qemu-kvm tries to attach an rbd with
exclusive-lock+objectmap enabled? I hope it will just refuse to
attach, rather than attach but allow bad stuff to happen.

Thanks in advance!

Dan

[1] By adding

  rbd default format = 2
  rbd default features = 13

to our client side ceph.conf.
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