On Tue, Feb 07, 2012 at 08:36:15AM -0600, Mitch Harder wrote:

Since you're getting "failed to read /dev/sr0" messages, that might be
an indication there are some newer btrfs-progs tools available.

You might want to try the building btrfs-progs from the git repository:
http://git.kernel.org/?p=linux/kernel/git/mason/btrfs-progs.git;a=summary

I did so, here's the new output (not much changed)
# /usr/local/btrfs-progs/bin/btrfs-show
**
** WARNING: this program is considered deprecated
** Please consider to switch to the btrfs utility
**
failed to read /dev/sr0: No medium found
Label: vicep-library  uuid: 89b14d35-b31a-4fbe-a2d9-cb83cbcd3851
        Total devices 1 FS bytes used 254.35GB
        devid    1 size 1.00TB used 299.04GB path /dev/dm-32

Btrfs Btrfs v0.19

# /usr/local/btrfs-progs/bin/btrfs device scan
Scanning for Btrfs filesystems
failed to read /dev/sr0

There are some recovery tools there that may extract your data (look
at the "recover" program).

I found a 'restore' program, are you referring to the mount option '-o
recovery'?

-- 
Ryan C. Underwood, [off-list ref]