hi guy's.

i new in your mailing list and i have a problem with my setup.

today my raid5 degraded totaly and i can fix it with a command to re-created
mdadm --create /dev/md2 --assume-clean --verbose --level=5 --raid-devices=4 /dev/sdc1 /dev/sdd1 missing /dev/sdf1
After this i add my /dev/sde1 also to my /dev/md2 device.

My problem is now the i cannot open my crypt device
cryptsetup luksOpen /dev/md2 md2_nas
Device /dev/md2 is not a valid LUKS device.

Befor one year i has the device created with this command:
luksformat -t ext4 /dev/md0

A dont have a backup of the header.

Is the filesystem broken?
fsck /dev/md2
fsck from util-linux 2.20.1
e2fsck 1.42 (29-Nov-2011)
fsck.ext2: Superblock invalid, trying backup blocks...
fsck.ext2: Bad magic number in super-block while trying to open /dev/md2

Is there a chance to get my data from the device?

Thank you.