Hab's gelöst. (War ja einfacher als ich gestern abend dachte.)
mdadm --assemble /dev/md0 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1
fizz:/dev# mdadm --detail /dev/md0
/dev/md0:
Version : 0.90
Creation Time : Fri Aug 6 09:28:28 2010
Raid Level : raid5
Array Size : 2930279808 (2794.53 GiB 3000.61 GB)
Used Dev Size : 976759936 (931.51 GiB 1000.20 GB)
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Persistence : Superblock is persistent
Update Time : Wed Dec 29 06:25:48 2010
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : f68883a0:c08c26f2:ea7e860f:e8472d31
Events : 0.22
Number Major Minor RaidDevice State
0 8 49 0 active sync /dev/sdd1
1 8 65 1 active sync /dev/sde1
2 8 33 2 active sync /dev/sdc1
3 8 17 3 active sync /dev/sdb1
====> Yay, raid is up & running!
fizz:/dev# lvm vgdisplay
--- Volume group ---
VG Name vg0
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 8
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 0
Max PV 0
Cur PV 1
Act PV 1
VG Size 2.73 TiB
PE Size 4.00 MiB
Total PE 715400
Alloc PE / Size 204800 / 800.00 GiB
Free PE / Size 510600 / 1.95 TiB
VG UUID 4Ta88j-2K6m-GUEU-UCtO-lHOD-gHb6-lJQ139
====> Schaut auch nicht so schlecht aus.
fizz:/dev# lvm lvdisplay
--- Logical volume ---
LV Name /dev/vg0/tm
VG Name vg0
LV UUID kZHqZz-UNZX-CYB1-hbld-r7JR-fd0d-TOAd1E
LV Write Access read/write
LV Status NOT available
LV Size 300.00 GiB
Current LE 76800
Segments 1
Allocation inherit
Read ahead sectors auto
--- Logical volume ---
LV Name /dev/vg0/smb
VG Name vg0
LV UUID AXXNu9-YGcx-EVll-X0nl-dYgG-bXou-CJiB0z
LV Write Access read/write
LV Status NOT available
LV Size 500.00 GiB
Current LE 128000
Segments 1
Allocation inherit
Read ahead sectors auto
====> Hm, "NOT available"...?
lvm vgchange -a y vg0
fizz:/# lvm lvdisplay
--- Logical volume ---
LV Name /dev/vg0/tm
VG Name vg0
LV UUID kZHqZz-UNZX-CYB1-hbld-r7JR-fd0d-TOAd1E
LV Write Access read/write
LV Status available
# open 0
LV Size 300.00 GiB
Current LE 76800
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 768
Block device 253:0
--- Logical volume ---
LV Name /dev/vg0/smb
VG Name vg0
LV UUID AXXNu9-YGcx-EVll-X0nl-dYgG-bXou-CJiB0z
LV Write Access read/write
LV Status available
# open 1
LV Size 500.00 GiB
Current LE 128000
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 768
Block device 253:1
====> Yay! Alles da und lesbar!
Herrschaften, herzlichen Dank für die Aufmerksamkeit. Es hilft sich über seine Problemchen mitzuteilen.