LinuxQuestions.org - Manual assembly of RAID array works, won't come up on boot.

On a Debian system, I have a RAID 10 array (/dev/md0) consisting of:

/dev/sda
/dev/sdb
/dev/sdc
/dev/sdd

Doing

Code:

mdadm --assemble /dev/md0 /dev/sda /dev/sdb /dev/sdc /dev/sdd

assembles the array and all the data is still intact. The array used to assemble on its own after boot; however, after an update is no longer doing this. I've tried adding

Code:

devices=/dev/sda,/dev/sdb,/dev/sdc,/dev/sdd

after the UUID to the mdadm.conf; however, I've still not been able to have it assemble on boot. The UUIDs of all the drives appear to be identical.

My mdadm.conf is below.

Code:

# mdadm.conf

#

# Please refer to mdadm.conf(5) for information about this file.

#



# by default, scan all partitions (/proc/partitions) for MD superblocks.

# alternatively, specify devices to scan, using wildcards if desired.

DEVICE partitions



# auto-create devices with Debian standard permissions

CREATE owner=root group=disk mode=0660 auto=yes



# automatically tag new arrays as belonging to the local system

HOMEHOST <system>



# instruct the monitoring daemon where to send mail alerts

MAILADDR **EDITED**



# definitions of existing MD arrays



# This file was auto-generated on Tue, 29 Dec 2009 18:03:33 -0600

# by mkconf $Id$

ARRAY /dev/md0 level=raid10 num-devices=4 UUID=3cf5b28a:b42c3ef0:715bc1c1:92c95b45

Any ideas?