On Thu, Mar 5, 2026 at 4:43 PM Matthias Riße via ceph-users <ceph-users@ceph.io> wrote:
Hey Sascha,
I ran into this issue too and was quite puzzled. There is this open PR which suggests that group snapshot exports are unsupported as of now: https://github.com/ceph/ceph/pull/40808
The best thing I could figure out to get consistent snapshots with multiple rbd's is to fsfreeze my filesystems (using libvirt, so domfs{freeze,thaw} in my case) and make individual snapshots of the rbd images.
Hi Matthias, I just want to note that freezing the filesystem is indeed a very good thing because in the end (whether you then take snapshots individually or with "rbd group snap create") you get a set of image snapshots that are filesystem-consistent. "rbd group snap create" in isolation would produce only a crash-consistent set of image snapshots. Thanks, Ilya