Your objective is to mount a LVM snapshot where the origin is a XFS filesystem. On mounting the snapshot to its mount point you get the following feedback:
[root@server0 ~]# mount /dev/mapper/VG_DB-SNAP_MARIA /backups/maria/
mount: wrong fs type, bad option, bad superblock on /dev/mapper/VG_DB-SNAP_MARIA,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so.
If you notice the feedback, it suggests to run the dmesg command and you notice the following:
[86803.183360] XFS (dm-1): Filesystem has duplicate UUID 9e92f93c-1b03-4383-b753-ae4b449b6864 - can't mount
If you didn’t notice that, and checked /var/log/messages you would see something similar:
Feb 25 11:05:14 localhost kernel: XFS (dm-1): Filesystem has duplicate UUID 9e92f93c-1b03-4383-b753-ae4b449b6864 - can't mount
There are 2 things that you can do:
[1] Mount the filesystem without using its UUID
mount -o nouuid /dev/mapper/VG_DB-SNAP_MARIA /backups/maria/
or:
[2] Change the UUID of the snapshot LVM
xfs_repair -L /dev/mapper/VG_DB-SNAP_MARIA
xfs_admin -U $(uuidgen) /dev/mapper/VG_DB-SNAP_MARIA
mount /dev/mapper/VG_DB-SNAP_MARIA /backups/maria/
