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/etc/cron.daily/mdadm:
mdadm: No mail address or alert command - not monitoring.
run-parts: /etc/cron.daily/mdadm exited with return code 1

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root@Debian-60-squeeze-64-minimal:/dev# ls -l /dev/md*
brw-rw---- 1 root disk 9, 0 Sep  7 18:55 /dev/md0
brw-rw---- 1 root disk 9, 1 Sep  7 18:55 /dev/md1
brw-rw---- 1 root disk 9, 2 Sep  7 18:55 /dev/md2

/dev/md:
total 0

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root@Debian-60-squeeze-64-minimal:~# cat /proc/mdstat
Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md2 : active raid1 sda3[0] sdb3[1]
      729952192 blocks [2/2] [UU]

md1 : active raid1 sda2[0] sdb2[1]
      524224 blocks [2/2] [UU]

md0 : active (auto-read-only) raid1 sda1[0] sdb1[1]
      2096064 blocks [2/2] [UU]

unused devices: <none>