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I had a motherboard failure causing the system to reboot over and over again. Now my drives show it's a RAID 1 but doesn't see the LUKs on it. The drives appear to be fine otherwise. Any way I can fix? I have the passwords still. Happened on Arch and Ubuntu.
Last edited by Pr0Wolf29 (2017-10-25 00:02:17)
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Provide more info.
file -s /dev/sd* /dev/md*
mdadm --examine /dev/sd*
cryptsetup luksDump /dev/md*
You need a valid LUKS header. If it's damaged, that's the end of it.
Last edited by frostschutz (2017-10-23 11:02:23)
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I'll collect the output after work. If I don't have a LUKs header, can I use one from a drive that is the same size and key?
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/dev/sda: DOS/MBR boot sector
/dev/sda1: Linux/i386 swap file (new style), version 1 (4K pages), size 1572863 pages, no label, UUID=32c2cdf2-255a-4988-a8fd-10a895ad44a5
/dev/sda2: Linux rev 1.0 ext4 filesystem data, UUID=193eaf09-cedf-4213-a937-172c2de55f02 (needs journal recovery) (extents) (64bit) (large files) (huge files)
/dev/sdb: Linux Software RAID version 1.2 (1) UUID=852880c8:c65f1ebc:b487cbe4:7afc00b6 name=Server2:6 level=1 disks=2
/dev/sdc: Linux Software RAID version 1.2 (1) UUID=852880c8:c65f1ebc:b487cbe4:7afc00b6 name=Server2:6 level=1 disks=2
/dev/md127: empty
/dev/sda:
MBR Magic : aa55
Partition[0] : 12582912 sectors at 2048 (type 82)
Partition[1] : 475812208 sectors at 12584960 (type 83)
/dev/sdb:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : 852880c8:c65f1ebc:b487cbe4:7afc00b6
Name : Server2:6
Creation Time : Tue Jun 7 21:33:55 2016
Raid Level : raid1
Raid Devices : 2
Avail Dev Size : 7813775024 (3725.90 GiB 4000.65 GB)
Array Size : 3906887488 (3725.90 GiB 4000.65 GB)
Used Dev Size : 7813774976 (3725.90 GiB 4000.65 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262056 sectors, after=48 sectors
State : clean
Device UUID : 6f0a14b1:6ac2863b:ab131547:ae6c4f5b
Update Time : Sun Oct 22 11:50:57 2017
Bad Block Log : 512 entries available at offset 72 sectors
Checksum : 5cc6b9cd - expected 5cc6b9cc
Events : 34556
Device Role : Active device 0
Array State : AA ('A' == active, '.' == missing, 'R' == replacing)
/dev/sdc:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 852880c8:c65f1ebc:b487cbe4:7afc00b6
Name : Server2:6
Creation Time : Tue Jun 7 21:33:55 2016
Raid Level : raid1
Raid Devices : 2
Avail Dev Size : 7813775024 (3725.90 GiB 4000.65 GB)
Array Size : 3906887488 (3725.90 GiB 4000.65 GB)
Used Dev Size : 7813774976 (3725.90 GiB 4000.65 GB)
Data Offset : 262144 sectors
Super Offset : 8 sectors
Unused Space : before=262056 sectors, after=48 sectors
State : clean
Device UUID : d35cab6e:2f03e8ee:e88d8011:9646ff68
Internal Bitmap : 8 sectors from superblock
Update Time : Sun Oct 22 11:50:57 2017
Bad Block Log : 512 entries available at offset 72 sectors
Checksum : a5daa11c - correct
Events : 34556
Device Role : Active device 1
Array State : AA ('A' == active, '.' == missing, 'R' == replacing)
cryptsetup luksDump /dev/md*
Showed nothing
Edit:
I Googled how to find a LUKS header, and stumbled upon this post showing how to find the header: https://ubuntuforums.org/showthread.php … st10228047 Later in the thread, I found this this post by frostschutz (who replied in this thread earlier, though the post he made is 7 years ago) and was able to mount by the offset. I'm so glad, nearly lost many TBs of stuff,
Last edited by Pr0Wolf29 (2017-10-25 00:01:24)
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