If you create stacked md devices, ala:
[root@pe-fc4 devel]# cat /proc/mdstat
Personalities : [raid0] [raid5] [multipath]
md_d0 : active raid5 md3[3] md2[2] md1[1] md0[0]
53327232 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]
md3 : active multipath sdm1[1] sdi1[0]
17775808 blocks [2/2] [UU]
md2 : active multipath sdl1[1] sdh1[0]
17775808 blocks [2/2] [UU]
md1 : active multipath sdk1[1] sdg1[0]
17775808 blocks [2/2] [UU]
md0 : active multipath sdj1[0] sdf1[1]
17775808 blocks [2/2] [UU]
unused devices: <none>
[root@pe-fc4 devel]#
and then run mdadm -E --scan, then you get this (obviously wrong)
output:
[root@pe-fc4 devel]# /sbin/mdadm -E --scan
ARRAY /dev/md0 level=multipath num-devices=2
UUID=34f4efec:bafe48ef:f1bb5b94:f5aace52
devices=/dev/sdj1,/dev/sdf1
ARRAY /dev/md1 level=multipath num-devices=2
UUID=bbaaf9fd:a1f118a9:bcaa287b:e7ac8c0f
devices=/dev/sdk1,/dev/sdg1
ARRAY /dev/md2 level=multipath num-devices=2
UUID=a719f449:1c63e488:b9344127:98a9bcad
devices=/dev/sdl1,/dev/sdh1
ARRAY /dev/md3 level=multipath num-devices=2
UUID=37b23a92:f25ffdc2:153713f7:8e5d5e3b
devices=/dev/sdm1,/dev/sdi1
ARRAY /dev/md0 level=raid5 num-devices=4
UUID=910b1fc9:d545bfd6:e4227893:75d72fd8
devices=/dev/md3,/dev/md2,/dev/md1,/dev/md0,/dev/md3,/dev/md2,/dev/md1,/dev/md0
[root@pe-fc4 devel]#
This is with mdadm-1.11.0.
--
Doug Ledford <dledford@xxxxxxxxxx>
http://people.redhat.com/dledford
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