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 <vikasra...@gmail.com> 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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