mdadm

# 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 root

# definitions of existing MD arrays
ARRAY /dev/md0 metadata=0.90 UUID=b0d7c72f:7f375886:776c2c25:004bd7b2
ARRAY /dev/md1 metadata=0.90 UUID=0a825908:1e676346:776c2c25:004bd7b2
ARRAY /dev/md2 metadata=0.90 UUID=e9e93bcd:1c2e7296:776c2c25:004bd7b2
ARRAY /dev/md4 metadata=0.90 UUID=6be8485e:ccfa5751:776c2c25:004bd7b2
ARRAY /dev/md3 metadata=0.90 UUID=13523099:c9aa2516:776c2c25:004bd7b2