Hello,
in case anyone finds this post while trying to find an answer to the
same question, I believe the answer is here:
https://lists.ceph.io/hyperkitty/list/ceph-users@ceph.io/message/DBJRYTMQURANFFWSS4QDCKD5KULJQ46X/
As far as I understand it:
Creating a snapshot requires to acquire the lock and with "-oexclusive"
the RBD client is not going to release it. So this is not a bug.
Best regards,
Andreas
On 30.11.22 12:58, Andreas Teuchert wrote:
Hello,
creating snapshots of RBD images that are mapped with -oexclusive seems
not to be possible:
# rbd map -oexclusive rbd.blu1/andreasspielt-share11
/dev/rbd7
# rbd snap create rbd.blu1/andreasspielt-share11@ateuchert_test01
Creating snap: 0% complete...failed.
rbd: failed to create snapshot: (30) Read-only file system
# rbd unmap rbd.blu1/andreasspielt-share11
# rbd map rbd.blu1/andreasspielt-share11
/dev/rbd7
rbd snap create rbd.blu1/andreasspielt-share11@ateuchert_test01
Creating snap: 100% complete...done.
I was surprised by this behavior and the documentation seems not to
mention this.
Is this on purpose or a bug?
Ceph version is 17.2.5, RBD client is Ubuntu 22.04 with kernel
5.15.0-52-generic.
Best regards,
Andreas
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