I'm running Ubuntu 11.04, with the / partition in an encrypted LVM volume. /home is in the same logical volume. I'm trying to use the LVM snapshot functionality to enable time-consistent backups of the running system.
I left over 500MB of unpartitioned space in the volume group, as I understand it needs that empty space for snapshot data. Whenever I try to create a snapshot, this is what happens:
$ sudo lvscan ACTIVE '/dev/vgroup1/volume1' [10.62 GiB] inherit $ sudo lvcreate -L400M -s -n snapit /dev/vgroup1/volume1 The link /dev/vgroup1/snapit should had been created by udev but it was not found. Falling back to direct link creation. semid 589825: semop failed for cookie 0xd4d5c76: incorrect semaphore state Failed to set a proper state for notification semaphore identified by cookie value 223173750 (0xd4d5c76) to initialize waiting for incoming notifications. Logical volume "snapit" created
What am I doing wrong? Or is this an Ubuntu bug?