I've got my Ubuntu 13.04 install backed up to my external hard drive using deja-dup.  I formatted the drive with lvm so I could use the rest of the drive for external storage while having the resize capeabilites of an lv.  When I plug the drive in to backup, it mounts and runs properly.  Backup's done, I hit the eject button to unmount the backup lv, everything still green.  I unplug the drive, noting the activity light is on but doesn't go off.After doing this I want to access the storage, so I plug the drive in but get an error which reads:Unable to access storage Error mounting /dev/dm-2 at /media/alex/storage: Command-line `mount -t ext4 >-o uhelper=udisks2,nodev,nosuid /dev/dm-2 /media/alex/storage' exited >with non-zero exit status 32: mount: wrong fs type, bad option, bad superblock >on /dev/mapper/VG1-storage,      missing codepage or helper program, or other error      In some cases useful info is found in syslog - try      dmesg | tail  or soI've messed around Linux and the command line long enough to know it's not mounting properly because it wasn't unmounted properly, but after a couple of week's worth of searching and hacking I'm still resorting rebooting in order to fix it.  What's the procedure to unmount a physical volume?
Unmount external drive with LVM2 Physical Volume on it
ubuntu;lvm;unmounting;duplicity