To give more output. This is XFS FS.
root@vtier-node1:~# rbd-nbd --read-only map testm-pool/test01
2018-12-12 13:04:56.674818 7f1c56e29dc0 -1 asok(0x560b19b3bdf0) AdminSocketConfigObs::init: failed: AdminSocket::bind_and_listen: failed to bind the UNIX domain socket to '/var/run/ceph/ceph-client.admin.asok': (17) File exists
/dev/nbd0
root@vtier-node1:~#
root@vtier-node1:~# mount /dev/nbd0 /mnt
mount: block device /dev/nbd0 is write-protected, mounting read-only
mount: /dev/nbd0: can't read superblock
root@vtier-node1:~# mount -ro,norecovery /dev/nbd0 /mnt
mount: /dev/nbd0: can't read superblock
root@vtier-node1:~# mount -o ro,norecovery /dev/nbd0 /mnt
mount: /dev/nbd0: can't read superblock
root@vtier-node1:~# fdisk -l /dev/nbd0
root@vtier-node1:~#
Thanks,
-Vikas
On Wed, Dec 12, 2018 at 10:44 AM Vikas Rana <vikasrana3@xxxxxxxxx> wrote:
Hi,We are using Luminous and copying a 100TB RBD image to DR site using RBD Mirror.Everything seems to works fine.The question is, can we mount the DR copy as Read-Only? We can do it on Netapp and we are trying to figure out if somehow we can mount it RO on DR site, then we can do backups at DR site.When i tried it mount it via, RBD-NBD, it complains about super-block. When I promoted the DR copy, the same image works fine. So data is there but cant be mounted.We also tried taking snap but it complains that it can't take snap of a Read-only copy.Any suggestion or pointer will be greatly appreciated.Thanks,-Vikas
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