[rhelv6-list] md and mdadm issue

[Bryan Hepworth]

Hi all

I recently had an issue with my md1200 with a Linux software raid. Originally I split it into 2 10TB partitions with Disk Manager.

They received device numbers /dev/md126 and /dev/md127 - recently there was a bit of a power issue, and a DOA replacement drive, which has now been replaced. Unfortunately there now appears to be a couple of different device numbers, /dev/md0 and /dev/md1 and the new drive /dev/sdp as below: -

unused devices: <none>
[root at inscribe2 mail]# lsscsi -g
[0:0:32:0]   enclosu DP       BACKPLANE        1.07  -         /dev/sg0
[0:2:0:0]    disk    DELL     PERC H700        2.10  /dev/sda   /dev/sg1
[0:2:1:0]    disk    DELL     PERC H700        2.10  /dev/sdb   /dev/sg2
[1:0:0:0]    cd/dvd  TEAC     DVD-ROM DV-28SW  R.2A  /dev/sr0   /dev/sg3
[5:0:0:0]    tape    IBM      ULT3580-HH4      A233  /dev/st0   /dev/sg4
[5:0:0:1]    mediumx IBM      3573-TL          9.50  /dev/sch0  /dev/sg5
[5:0:1:0]    disk    WD       WD2000FYYG       D1B3  /dev/sdc   /dev/sg6
[5:0:2:0]    disk    WD       WD2000FYYG       D1BC  /dev/sdd   /dev/sg7
[5:0:3:0]    disk    WD       WD2000FYYG       D1BC  /dev/sde   /dev/sg8
[5:0:4:0]    disk    WD       WD2000FYYG       D1BC  /dev/sdf   /dev/sg9
[5:0:5:0]    disk    WD       WD2000FYYG       D1B3  /dev/sdg   /dev/sg10
[5:0:6:0]    disk    WD       WD2000FYYG       D1B3  /dev/sdh   /dev/sg11
[5:0:7:0]    disk    WD       WD2000FYYG       D1B3  /dev/sdi   /dev/sg12
[5:0:8:0]    disk    WD       WD2000FYYG       D1B3  /dev/sdj   /dev/sg13
[5:0:9:0]    disk    WD       WD2000FYYG       D1B3  /dev/sdk   /dev/sg14
[5:0:10:0]   disk    WD       WD2000FYYG       D1BB  /dev/sdl   /dev/sg15
[5:0:11:0]   disk    WD       WD2000FYYG       D1BB  /dev/sdm   /dev/sg16
[5:0:12:0]   enclosu DELL     MD1200           1.01  -         /dev/sg17
[5:0:13:0]   disk    WD       WD2001FYYG-01SL3 VR07  /dev/sdp   /dev/sg22
[6:0:0:0]    tape    IBM      ULT3580-HH4      A233  /dev/st1   /dev/sg18
[6:0:1:0]    disk    DELL     MD32xx           0770  /dev/sdn   /dev/sg19
[6:0:1:1]    disk    DELL     MD32xx           0770  /dev/sdo   /dev/sg20
[6:0:1:31]   disk    DELL     Universal Xport  0770  -         /dev/sg21

[root at inscribe2 mail]# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md1 : inactive sdg1[0]
      1953510977 blocks super 1.2

md0 : inactive sdf1[1] sdc1[6] sdd1[4] sde1[2]
      7814043908 blocks super 1.2

md127 : active raid5 sdi1[4] sdh1[6] sdk1[2] sdj1[3] sdl1[1] sdm1[0]
      9767552000 blocks super 1.2 level 5, 512k chunk, algorithm 2 [6/6] [UUUUUU]
      bitmap: 1/15 pages [4KB], 65536KB chunk

unused devices: <none>
[root at inscribe2 mail]#

How do I go about moving the drives back into /dev/md126 ? would I be right in thinking I issue mdadm --assemble --verbose /dev/md126 /dev/sdc /dev/sdd /dev/sde /dev/sdf /dev/sdg /dev/sdp
Any pointers gratefully received on the process.

Thanks

Bryan

Bryan Hepworth
Computing Officer
Institute of Genetic Medicine
Newcastle University
International Centre for Life
Newcastle
NE1 3BZ