Backup data from RAID 1 disk out of its server
- by Doomsday
I'm facing with a pretty easy problem in my opinion.
I've extracted a working disk from a RAID1 and I'm looking to copy only data (FS and RAID configuration doesn't matter) into another location (another FS).
My problem is I'm not able to mount properly this disk into another linux.
I've first looked the partition table :
# fdisk -l /dev/sdc
Disk /dev/sdc: 640.1 GB, 640135028736 bytes
255 heads, 63 sectors/track, 77825 cylinders, total 1250263728 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Device Boot Start End Blocks Id System
/dev/sdc1 63 1249535699 624767818+ fd Linux raid autodetect
/dev/sdc2 1249535700 1250017649 240975 fd Linux raid autodetect
/dev/sdc3 1250017650 1250258624 120487+ 82 Linux swap / Solaris
I've understood I should use dmraid tools. Once installed :
# cat /proc/mdstat
Personalities :
md0 : inactive sdc1[1](S)
624767744 blocks
unused devices: <none>
And some other informations :
# mdadm --examine /dev/sdc1
/dev/sdc1:
Magic : a92b4efc
Version : 0.90.00
UUID : 8f292f54:7e5aef72:7e5ab5fd:b348fd05
Creation Time : Mon Jun 2 03:39:41 2008
Raid Level : raid1
Used Dev Size : 624767744 (595.82 GiB 639.76 GB)
Array Size : 624767744 (595.82 GiB 639.76 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Update Time : Tue Feb 7 22:34:59 2012
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : a505b324 - correct
Events : 15148
Number Major Minor RaidDevice State
this 1 8 1 1 active sync /dev/sda1
0 0 8 17 0 active sync /dev/sdb1
1 1 8 1 1 active sync /dev/sda1
From here, I've tried to mount but I'm not comfortable with dmtools and how it's working.
# mount /dev/sdc1 /mnt/sdc1
mount: unknown filesystem type 'linux_raid_member'
# mount /dev/md0 /mnt/sdc1
mount: /dev/md0: can't read superblock
I've seen some options to alter RAID array with mdadm but I only want to copy data on its filesystem before wiping them... Anyone has a clue ?