Hello Dave,
many thx for your help and your explainations. The first step seems to work. Am i right? Therefore the next step is to readd the missing sdd4 (mdadm --add /dev/md2 /dev/sdd4)
mdadm -A /dev/md2 -R /dev/sda4 /dev/sdb4 /dev/sdc4 /dev/sdf4 /dev/sde4
mdadm: /dev/md2 has been started with 5 drives (out of 6).
-------------
output of dmesg
mdadm: sending ioctl 1261 to a partition!
[ 9884.422907] mdadm: sending ioctl 1261 to a partition!
[ 9884.422916] mdadm: sending ioctl 1261 to a partition!
[ 9884.540433] mdadm: sending ioctl 1261 to a partition!
[ 9884.540443] mdadm: sending ioctl 1261 to a partition!
[ 9884.561874] mdadm: sending ioctl 1261 to a partition!
[ 9884.561884] mdadm: sending ioctl 1261 to a partition!
[ 9884.562283] mdadm: sending ioctl 1261 to a partition!
[ 9884.562292] mdadm: sending ioctl 1261 to a partition!
[ 9885.381902] md: md2 stopped.
[ 9885.431051] md: bind<sdb4>
[ 9885.431185] md: bind<sdc4>
[ 9885.436744] md: bind<sdf4>
[ 9885.437110] md: bind<sde4>
[ 9885.437415] md: bind<sda4>
[ 9885.518260] raid5: device sda4 operational as raid disk 0
[ 9885.518264] raid5: device sde4 operational as raid disk 4
[ 9885.518266] raid5: device sdf4 operational as raid disk 3
[ 9885.518267] raid5: device sdc4 operational as raid disk 2
[ 9885.518269] raid5: device sdb4 operational as raid disk 1
[ 9885.518644] raid5: allocated 6386kB for md2
[ 9885.518843] 0: w=1 pa=0 pr=6 m=1 a=2 r=6 op1=0 op2=0
[ 9885.518847] 4: w=2 pa=0 pr=6 m=1 a=2 r=6 op1=0 op2=0
[ 9885.518849] 3: w=3 pa=0 pr=6 m=1 a=2 r=6 op1=0 op2=0
[ 9885.518851] 2: w=4 pa=0 pr=6 m=1 a=2 r=6 op1=0 op2=0
[ 9885.518853] 1: w=5 pa=0 pr=6 m=1 a=2 r=6 op1=0 op2=0
[ 9885.518855] raid5: raid level 5 set md2 active with 5 out of 6 devices, algorithm 2
[ 9885.518871] RAID5 conf printout:
[ 9885.518872] --- rd:6 wd:5
[ 9885.518874] disk 0, o:1, dev:sda4
[ 9885.518876] disk 1, o:1, dev:sdb4
[ 9885.518877] disk 2, o:1, dev:sdc4
[ 9885.518879] disk 3, o:1, dev:sdf4
[ 9885.518880] disk 4, o:1, dev:sde4
[ 9885.518894] md2: Warning: Device sde4 is misaligned
[ 9885.518896] md2: Warning: Device sdf4 is misaligned
[ 9885.518920] md2: detected capacity change from 0 to 14957451673600
[ 9885.520484] md2: unknown partition table
---
mdadm -D /dev/md2
/dev/md2:
Version : 1.2
Creation Time : Tue Feb 5 17:44:45 2013
Raid Level : raid5
Array Size : 14606886400 (13930.21 GiB 14957.45 GB)
Used Dev Size : 2921377280 (2786.04 GiB 2991.49 GB)
Raid Devices : 6
Total Devices : 5
Persistence : Superblock is persistent
Update Time : Tue Feb 5 17:44:45 2013
State : clean, degraded
Active Devices : 5
Working Devices : 5
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 512K
Name : mfsnode1:2 (local to host mfsnode1)
UUID : e84f0346:3f5ff3f1:507b6f9c:0fa02c63
Events : 0
Number Major Minor RaidDevice State
0 8 4 0 active sync /dev/sda4
1 8 20 1 active sync /dev/sdb4
2 8 36 2 active sync /dev/sdc4
3 8 84 3 active sync /dev/sdf4
4 8 68 4 active sync /dev/sde4
5 0 0 5 removed
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