mdadm + re-install

[marcovanb]

Hi,

I have a media server (mythbuntu) that originally had 8.10 installed. I upgraded it through the updates. I have been unhappy with this due to some issues and want to do a reinstall with mythbuntu 9.04.

With this system I had two 200gb drives and two 1tb drives. Both are in a mirror, using mdadm, though one of the 200gb drives needs replacing. So I have two questions.

1 - If I rebuild the system with one 200gb hard drive can I at a later date add another hard drive using mdadm, to provide redundancy, even though it is the bootable drive?

2 - How can I re-add my 1tb mdadm mirror to the new OS without losing data?

Any Help would be greatly appreciated

Nick

Output from parted


(parted) print all
Model: ATA WDC WD2000JS-00M (scsi)
Disk /dev/sda: 200GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number Start End Size Type File system Flags
1 32.3kB 196GB 196GB primary ext3 boot, raid
2 196GB 200GB 4047MB extended
5 196GB 200GB 4047MB logical linux-swap raid


Model: ATA WDC WD10EACS-00D (scsi)
Disk /dev/sdb: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number Start End Size Type File system Flags
1 32.3kB 1000GB 1000GB extended
5 64.5kB 1000GB 1000GB logical ext3


Model: ATA WDC WD10EACS-00D (scsi)
Disk /dev/sdc: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number Start End Size Type File system Flags
1 32.3kB 1000GB 1000GB extended
5 64.5kB 1000GB 1000GB logical ext3


Model: Unknown (unknown)
Disk /dev/md2: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: loop

Number Start End Size File system Flags
1 0.00B 1000GB 1000GB ext3


Model: Unknown (unknown)
Disk /dev/md0: 196GB
Sector size (logical/physical): 512B/512B
Partition Table: loop

Number Start End Size File system Flags
1 0.00B 196GB 196GB ext3


Error: /dev/md1: unrecognised disk label

Output from mdadm


nmagers@jupiter:~$ sudo mdadm --misc --detail /dev/md0
/dev/md0:
Version : 00.90
Creation Time : Fri Feb 20 21:11:28 2009
Raid Level : raid1
Array Size : 191406336 (182.54 GiB 196.00 GB)
Used Dev Size : 191406336 (182.54 GiB 196.00 GB)
Raid Devices : 2
Total Devices : 1
Preferred Minor : 0
Persistence : Superblock is persistent

Update Time : Tue Sep 8 06:54:40 2009
State : active, degraded
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0

UUID : 2b6e7717:60a1aa02:1b3645e8:3093a15c
Events : 0.1323553

Number Major Minor RaidDevice State
0 0 0 0 removed
1 8 1 1 active sync /dev/sda1

nmagers@jupiter:~$ sudo mdadm --misc --detail /dev/md2
/dev/md2:
Version : 00.90
Creation Time : Fri Feb 20 21:11:50 2009
Raid Level : raid1
Array Size : 976759872 (931.51 GiB 1000.20 GB)
Used Dev Size : 976759872 (931.51 GiB 1000.20 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 2
Persistence : Superblock is persistent

Update Time : Tue Sep 8 06:55:19 2009
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0

UUID : f5bfef27:77448d0b:ced7eae6:ea2af11e
Events : 0.218

Number Major Minor RaidDevice State
0 8 21 0 active sync /dev/sdb5
1 8 37 1 active sync /dev/sdc5