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cat /proc/mdstat
Personalities : [raid1] 
md1 : active raid1 sdb2[1]
      312327616 blocks [2/1] [_U]
      
md0 : active raid1 sdb1[1]
      240832 blocks [2/1] [_U]
      
unused devices: none

server:~# fdisk -l /dev/sda

Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0003422e

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          30      240943+  fd  Linux raid autodetect
/dev/sda2              31       38913   312327697+  fd  Linux raid autodetect
server:~# 
server:~# fdisk -l /dev/sdb

Disk /dev/sdb: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0002f147

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1          30      240943+  fd  Linux raid autodetect
/dev/sdb2              31       38913   312327697+  fd  Linux raid autodetect

server:~# cat /etc/mdadm/mdadm.conf
# 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 level=raid1 num-devices=2 UUID=f611a71f:36f693cf:d2710fd2:4938d05e
ARRAY /dev/md1 level=raid1 num-devices=2 UUID=99be939b:58238c48:fa8b64fc:811dc3c8

# This file was auto-generated on Fri, 16 Jan 2009 17:55:32 +0100
# by mkconf $Id$

/dev/sdb1: UUID="f611a71f-36f6-93cf-d271-0fd24938d05e" TYPE="linux_raid_member" 
/dev/sdb2: UUID="99be939b-5823-8c48-fa8b-64fc811dc3c8" TYPE="linux_raid_member"