All, thanks in advance...particularly Neil.
My raid5 setup has 4 partitions, 2 of which are showing up as spare and 2 as active. The mdadm --assemble --force gives me the following error:
2 active devices and 2 spare cannot start device
it is a raid 5, with superblock 1.2, 4 devices in the order sda1, sdb5, sdc5, sdd5. I have lvm2 on top of this with other devices ...so as you all know data is irreplaceable blah blah.
I know that this device has not been written to for a while, so the data can be considered intact (hopefully all) if I can get the device to start up...but I'm not sure of the best way to coax the kernel to assemble it. Relevant information follows:
=== This device is working fine ===
mdadm --examine -e1.2 /dev/sdb5
/dev/sdb5:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 42c56ea0:2484f566:387adc6c:b3f6a014
Name : GATEWAY:127 (local to host GATEWAY)
Creation Time : Sat Aug 22 09:44:21 2009
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 586099060 (279.47 GiB 300.08 GB)
Array Size : 1758296832 (838.42 GiB 900.25 GB)
Used Dev Size : 586098944 (279.47 GiB 300.08 GB)
Data Offset : 272 sectors
Super Offset : 8 sectors
State : clean
Device UUID : f8ebb9f8:b447f894:d8b0b59f:ca8e98eb
Internal Bitmap : 2 sectors from superblock
Update Time : Fri Mar 19 00:56:15 2010
Checksum : 1005cfbc - correct
Events : 3796145
Layout : left-symmetric
Chunk Size : 64K
Device Role : Active device 2
Array State : .AA. ('A' == active, '.' == missing)
=== This device is marked spare, can be marked active (IMHO) ===
mdadm --examine -e1.2 /dev/sdd5
/dev/sdd5:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 42c56ea0:2484f566:387adc6c:b3f6a014
Name : GATEWAY:127 (local to host GATEWAY)
Creation Time : Sat Aug 22 09:44:21 2009
Raid Level : raid5
Raid Devices : 4
Avail Dev Size : 586099060 (279.47 GiB 300.08 GB)
Array Size : 1758296832 (838.42 GiB 900.25 GB)
Used Dev Size : 586098944 (279.47 GiB 300.08 GB)
Data Offset : 272 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 763a832f:1a9a7ea8:ce90d4a3:32e8ae54
Internal Bitmap : 2 sectors from superblock
Update Time : Fri Mar 19 00:56:15 2010
Checksum : c78aab46 - correct
Events : 3796145
Layout : left-symmetric
Chunk Size : 64K
Device Role : spare
Array State : .AA. ('A' == active, '.' == missing)
=== This is the completely failed device (needs replacement) ===
mdadm --examine -e1.2 /dev/sda1
[HANGS!!]
I already have the replacement drive available as sde5 but want to be able to reconstruct as much as possible)
Thanks again,
Anshuman Aggarwal--
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