I inherited a pair/cluster of Ubuntu 10.04 servers running DRBD and QEMU/KVM and I want to backup the img files but they appear to be block files on the DRBD fs and I'm not sure how I can back them up. I tried to use the qemu snapshot command; it replies: qemu-img: "Could not create snapshot 'rhea_snapshot': -95 (Operation not supported)" the img files are in /dev/mapper folder.
Here is an example:
brw-rw---- 1 root disk 251, 12 2013-03-20 10:55 vg00-server1.img