Hi all,
So I have an XFS file system within LVM which has an external log.
My mount option in FSTAB is;
/dev/vg_spock_data/lv_data /data xfs logdev=/dev/sdc1,nobarrier,logbufs=8,noatime,nodiratime 1 1
All is well no issues and very fast.
Now I'd like to snapshot this bad boy and then run rsnapshot to create a few days backup.
A snapshot volume is created w/o issue;
lvcreate -L250G -s -n datasnapshot /dev/vg_spock_data/lv_data
But when i try to mount the file system;
mount /dev/vg_spock_data/datasnapshot /snapshot -o nouuid,ro
I get this;
mount: wrong fs type, bad option, bad superblock on /dev/mapper/vg_anette_data-datasnapshot,
missing codepage or helper program, or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
The command dmesg shows;
XFS (dm-3): filesystem is marked as having an external log; specify logdev on the mount command line.
XFS (dm-3): SB validate failed
So I then use this mount option;
mount /dev/vg_anette_data/datasnapshot /snapshot -o logdev=/dev/sdc1,nouuid,ro
But get this error;
mount: /dev/mapper/vg_spock_data-datasnapshot already mounted or /snapshot busy
And the command dmesg shows;
XFS (dm-3): Invalid device [/dev/sdc1], error=-16
Am I doing something wrong or is this not possible?
I prefer being in error, I often am anyways.
Thanks in advance,
- aurf
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