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View Full Version : [ubuntu] Re-assembly of a software raid1 volume



pilou254
November 3rd, 2009, 07:16 PM
Hello,

I need to recover a volume software raid1 (2 discs) from an old installation (Suse 9.2 ...) on my new machine (Ubuntu 9.04).

The system is on a third disc.

Here is the informations I could get :



sudo mdadm --examine /dev/sdb1:

/dev/sdb1:
Magic : a92b4efc
Version : 00.90.00
UUID : 1c0e01f4:fbcb5d87:55357bc2:af01e9f5
Creation Time : Mon Oct 3 15:30:02 2005
Raid Level : raid1
Used Dev Size : 80043136 (76.34 GiB 81.96 GB)
Array Size : 80043136 (76.34 GiB 81.96 GB)
Raid Devices : 2
Total Devices : 1
Preferred Minor : 0

Update Time : Sat Oct 24 21:50:38 2009
State : clean
Active Devices : 1
Working Devices : 1
Failed Devices : 1
Spare Devices : 0
Checksum : 582927ec - correct
Events : 101590


Number Major Minor RaidDevice State
this 0 22 1 0 active sync

0 0 22 1 0 active sync
1 1 0 0 1 faulty removed


sudo mdadm --examine /dev/sdc1 :

/dev/sdc1:
Magic : a92b4efc
Version : 00.90.00
UUID : 1c0e01f4:fbcb5d87:55357bc2:af01e9f5
Creation Time : Mon Oct 3 15:30:02 2005
Raid Level : raid1
Used Dev Size : 80043136 (76.34 GiB 81.96 GB)
Array Size : 80043136 (76.34 GiB 81.96 GB)
Raid Devices : 2
Total Devices : 1
Preferred Minor : 0

Update Time : Sun Nov 1 02:14:15 2009
State : clean
Active Devices : 1
Working Devices : 1
Failed Devices : 0
Spare Devices : 0
Checksum : 5832ba85 - correct
Events : 103094


Number Major Minor RaidDevice State
this 1 22 65 1 active sync

0 0 0 0 0 removed
1 1 22 65 1 active sync
I guess the partitions must be assembled now but a node has to be created before with mknod ?

I can directly use the command :


mdadm --assemble /dev/md0 /dev/sdb1 /dev/sdc1 ?or


mdadm -- assemble -- scan ? Has anybody ever had this type of case (I am a littke afraid to loose all my data ...) ?
If yes, I'd like to take advantage of his experience.

Thank you in advance for your help.

Sincerely.