I use a RAID0 (md2) as a device in a RAID5 (md3) setup (see below). Now everytime the computer boots, mdadm will mark md3 as degraded and i am forced to re-add md2 as a new spare. Of course mdadm then starts resyncing/recovering.
Is there a way to tell mdadm to wait for md2 before assembling md3 on boot time, or another solution to this problem?
System (Ubuntu 12.10 Server 64bit):
$ uname -a
Linux nas-server.local 3.5.0-25-generic #39-Ubuntu SMP Mon Feb 25 18:26:58 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux
# mdadm --detail --scan
ARRAY /dev/md/2 metadata=1.2 name=lubuntu:1 UUID=70bdbcc1:a423c042:e798e197:56cc4396
ARRAY /dev/md/3 metadata=1.2 spares=1 name=lubuntu:0 UUID=bce57189:aa8ae91a:a1268e87:bef78ff4
ARRAY /dev/md/1 metadata=1.2 name=nas-server:1 UUID=fdc6b691:3ca45346:3b493827:8ca7ed4e
ARRAY /dev/md/0 metadata=1.2 name=nas-server:0 UUID=3bad2d5c:68517cb9:34631143:27c21bd1
Array /dev/md/2 is used as an active drive in /dev/md/3:
# mdadm --detail /dev/md2
/dev/md2:
Version : 1.2
Creation Time : Thu Mar 14 10:00:09 2013
Raid Level : raid0
Array Size : 2930276864 (2794.53 GiB 3000.60 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Update Time : Thu Mar 14 10:00:09 2013
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Chunk Size : 512K
Name : lubuntu:1
UUID : 70bdbcc1:a423c042:e798e197:56cc4396
Number Major Minor RaidDevice State
0 8 64 0 active sync /dev/sde
1 8 80 1 active sync /dev/sdf
/dev/md3:
Version : 1.2
Creation Time : Thu Mar 14 10:00:49 2013
Raid Level : raid5
Array Size : 5860270080 (5588.79 GiB 6000.92 GB)
Used Dev Size : 2930135040 (2794.39 GiB 3000.46 GB)
Raid Devices : 3
Total Devices : 3
Persistence : Superblock is persistent
Update Time : Mon Mar 18 14:56:49 2013
State : clean, degraded, recovering
Active Devices : 2
Working Devices : 3
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 512K
Rebuild Status : 12% complete
Name : lubuntu:0
UUID : bce57189:aa8ae91a:a1268e87:bef78ff4
Events : 25514
Number Major Minor RaidDevice State
4 8 32 0 active sync /dev/sdc
1 8 48 1 active sync /dev/sdd
3 9 2 2 spare rebuilding /dev/md/2