On 2011-12-14 19:01:01 +0000, Phil Turmel said:

Hi Troy,

On 12/13/2011 05:42 PM, Troy Telford wrote:

Let me guess:  You have version 0.90 superblock, and sdl1 covers the 
whole device?

sdl1 does cover the entire device, but I'm fairly certain I do not have 
a 0.90 superblock (Unless 0.90 was the standard version for Linux 2.6 
about two years ago.)

Unfortunately, I'm not sure how to get my current superblock version:
$ sudo mdadm --examine /dev/md2
mdadm: No md superblock detected on /dev/md2.

I find it curious that I can't detect the superblock for the MD device, 
even though the device is up, active, and working.

Short term, change your mdadm.conf to only accept device names that end 
with a digit.  Like so:

DEVICE /dev/sd[a-z][1-9]

OK, I'll give that a whirl.  For the record, it was DEVICE partitions 
previously.

Then rebuild your initramfs to include the new mdadm.conf.

Long term, rebuild your array with v1.x metadata.

You know, I was hoping to be able to wait until btrfs handles RAID-6 
(or "raid-z") arrays by the time I had to rebuild the array.  I guess 
I'm not that lucky.
-- 
Troy Telford