nas02:~# mdadm --create --verbose /dev/md1 --level=5 --raid-devices=4 --spare-devices=0 /dev/mapper/sda2 /dev/mapper/sdb2 /dev/mapper/sdc2 /dev/mapper/sdd2
mdadm: layout defaults to left-symmetric
mdadm: chunk size defaults to 64K
mdadm: /dev/mapper/sda2 appears to be part of a raid array:
level=raid5 devices=4 ctime=Sun Dec 26 21:10:15 2010
mdadm: /dev/mapper/sdb2 appears to be part of a raid array:
level=raid5 devices=4 ctime=Sun Dec 26 21:10:15 2010
mdadm: /dev/mapper/sdc2 appears to be part of a raid array:
level=raid5 devices=4 ctime=Sun Dec 26 21:10:15 2010
mdadm: /dev/mapper/sdd2 appears to be part of a raid array:
level=raid5 devices=4 ctime=Sun Dec 26 21:10:15 2010
mdadm: size set to 9501824K
Continue creating array? yes
mdadm: array /dev/md1 started.
nas02:~# cat /proc/mdstat
Personalities : [raid1] [raid6] [raid5] [raid4]
md1 : active
(auto-read-only) raid5 dm-3[4](S) dm-2[2] dm-1[1] dm-0[0]
28505472 blocks level 5, 64k chunk, algorithm 2 [
4/3] [
UUU_]
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