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fintan Apprentice
Joined: 06 Nov 2003 Posts: 150 Location: Dublin
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Posted: Sat Jun 24, 2006 9:44 am Post subject: Using livecd, mdadm to recover data from a software raid(5) |
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Hi I need to get data off a software raid(5). I know the partition layout & the file system type. I want to boot up into gentoo's live cd then bind the devices together.
/dev/hda1 /dev/hdb1 /dev/hdc1 /dev/hdd1
becomes
/dev/md0
Then I was hoping to connect to the network and transfer the files off the raid array. Can this be done? Thanks
fintan. |
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fintan Apprentice
Joined: 06 Nov 2003 Posts: 150 Location: Dublin
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Posted: Sat Jun 24, 2006 12:03 pm Post subject: |
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Here's what I got so far. The first device, lets say
hda1 has a file system of ext2 and is the boot partition.
hda2 is the root partition & is xfs.
hda3 is an extended partition
hda4 ?
hda5 is swap
hda6 ?
I have the log files & the raidtab. I'll post it in a minute. |
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fintan Apprentice
Joined: 06 Nov 2003 Posts: 150 Location: Dublin
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Posted: Sat Jun 24, 2006 12:11 pm Post subject: |
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raidtab
Code: |
raiddev /dev/md0
raid-level 5
nr-raid-disks 3
nr-spare-disks 1
persistent-superblock 1
chunk-size 64
device /dev/hda4
raid-disk 0
device /dev/hde4
raid-disk 1
device /dev/hdg4
raid-disk 2
device /dev/hdc4
spare-disk 0
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raidsettab
Code: |
/dev/md0 volgr0 1037693079 338432.000000/0 0 md0
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rootraidtab
Code: |
raiddev /dev/md100root
raid-level 1
nr-raid-disks 12
nr-spare-disks 0
persistent-superblock 1
chunk-size 32
device /dev/hda2
raid-disk 0
device /dev/hdc2
raid-disk 1
device /dev/hde2
raid-disk 2
device /dev/hdg2
raid-disk 3
device /dev/hdi2
raid-disk 4
device /dev/hdk2
raid-disk 5
device /dev/hdm2
raid-disk 6
device /dev/hdo2
raid-disk 7
device /dev/hdq2
raid-disk 8
device /dev/hds2
raid-disk 9
device /dev/hdu2
raid-disk 10
device /dev/hdw2
raid-disk 11
raiddev /dev/md101swap
raid-level 1
nr-raid-disks 12
nr-spare-disks 0
persistent-superblock 1
chunk-size 32
device /dev/hda5
raid-disk 0
device /dev/hdc5
raid-disk 1
device /dev/hde5
raid-disk 2
device /dev/hdg5
raid-disk 3
device /dev/hdi5
raid-disk 4
device /dev/hdk5
raid-disk 5
device /dev/hdm5
raid-disk 6
device /dev/hdo5
raid-disk 7
device /dev/hdq5
raid-disk 8
device /dev/hds5
raid-disk 9
device /dev/hdu5
raid-disk 10
device /dev/hdw5
raid-disk 11
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fintan Apprentice
Joined: 06 Nov 2003 Posts: 150 Location: Dublin
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Posted: Sat Jun 24, 2006 12:30 pm Post subject: |
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I was thinking of running the command
Code: | mdadm --create /dev/mdX --level=0 --auto=yes --raid-devices=4 /dev/hda1 /dev/hdb1 /dev/hdc1 /dev/hdd1 |
Good idea or bad idea? |
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fintan Apprentice
Joined: 06 Nov 2003 Posts: 150 Location: Dublin
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Posted: Sat Jun 24, 2006 1:02 pm Post subject: |
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Just started examining the raid devices
Code: |
mdadm -E /dev/hdc2
/dev/hdc2:
Magic : a92b4efc
Version : 00.90.00
UUID : 84f2f336:0607a562:8960620f:2d2a4b6e
Creation Time : Tue Nov 19 02:56:10 2002
Raid Level : raid1
Raid Devices : 4
Total Devices : 4
Preferred Minor : 100
Update Time : Thu Jun 22 12:32:31 2006
State : active
Active Devices : 1
Working Devices : 1
Failed Devices : 3
Spare Devices : 0
Checksum : 6d2e20c3 - correct
Events : 0.67
Number Major Minor RaidDevice State
this 3 33 2 3 active sync /dev/.static/dev/hde2
0 0 0 0 0 faulty removed
1 1 0 0 1 faulty removed
2 2 0 0 2 faulty removed
3 3 33 2 3 active sync /dev/.static/dev/hde2
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Code: |
/dev/hdc4:
Magic : a92b4efc
Version : 00.90.00
UUID : c181e171:f0d6106d:0e280436:7a5a32b0
Creation Time : Tue Nov 19 03:04:39 2002
Raid Level : raid5
Raid Devices : 4
Total Devices : 4
Preferred Minor : 0
Update Time : Mon May 22 07:49:58 2006
State : clean
Active Devices : 4
Working Devices : 4
Failed Devices : 0
Spare Devices : 0
Checksum : 6d34ef11 - correct
Events : 0.57
Layout : left-asymmetric
Chunk Size : 64K
Number Major Minor RaidDevice State
this 2 33 4 2 active sync /dev/.static/dev/hde4
0 0 3 4 0 active sync /dev/.static/dev/hda4
1 1 22 4 1 active sync /dev/hdc4
2 2 33 4 2 active sync /dev/.static/dev/hde4
3 3 34 4 3 active sync /dev/.static/dev/hdg4
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Code: |
mdadm -E /dev/hdc5
/dev/hdc5:
Magic : a92b4efc
Version : 00.90.00
UUID : bdec1430:4b540188:40c0eb2d:6aaa9a87
Creation Time : Tue Nov 19 02:56:10 2002
Raid Level : raid1
Raid Devices : 4
Total Devices : 5
Preferred Minor : 101
Update Time : Thu Jun 22 12:32:31 2006
State : active
Active Devices : 2
Working Devices : 2
Failed Devices : 3
Spare Devices : 0
Checksum : e0504b83 - correct
Events : 0.76
Number Major Minor RaidDevice State
this 2 33 5 2 active sync /dev/.static/dev/hde5
0 0 0 0 0 faulty removed
1 1 0 0 1 faulty removed
2 2 33 5 2 active sync /dev/.static/dev/hde5
3 3 22 5 3 active sync /dev/hdc5
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fintan Apprentice
Joined: 06 Nov 2003 Posts: 150 Location: Dublin
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Posted: Mon Jun 26, 2006 8:41 am Post subject: |
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Hi just wanted to bump this.
Can anyone tell me how you'd mount raid5 partition? |
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