On Jun 21, 2013, at 2:58 PM, Joseph L. Casale wrote: >> So I have an XFS file system within LVM which has an external log. > >> A snapshot volume is created w/o issue; > >> But when i try to mount the file system; >> mount: /dev/mapper/vg_spock_data-datasnapshot already mounted or /snapshot busy > > So the filesystem was built requiring an external log device? > Let me guess, the original block device is still mounted and accessing its log device? > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos So this worked; truncate --size=2G logfile losetup /dev/loop0 logfile mount /dev/vg_anette_data/datasnapshot /snapshot -o logdev=/dev/loop0,nouuid,ro Freezing the fs looks to make the log zero. So assigning any device/file for the external log would work. My mistake was not making the log dev an LVM. However I don't if a log on an LVM would have worked anyways. At any rate, HTH some one else. - aurf