Yesterday i grew my 4*500GB raid5 array to 7*500GB. The reshape operation
ended succesfully according to the logs :
May 22 22:24:56 [kernel] md: md2: reshape done.
May 22 22:24:56 [kernel] RAID5 conf printout:
May 22 22:24:56 [kernel] --- rd:7 wd:7
May 22 22:24:56 [kernel] disk 0, o:1, dev:dm-3
May 22 22:24:56 [kernel] disk 1, o:1, dev:dm-0
May 22 22:24:56 [kernel] disk 2, o:1, dev:dm-2
May 22 22:24:56 [kernel] disk 3, o:1, dev:dm-1
May 22 22:24:56 [kernel] disk 4, o:1, dev:dm-8
May 22 22:24:56 [kernel] disk 5, o:1, dev:dm-6
May 22 22:24:56 [kernel] disk 6, o:1, dev:dm-5
However, upon restarting this morning the grown array was no longer detected,
and my investigation revealed that the 3 device that were added do not contain
an md superblock at all !
One of the 3 new devices :
mdadm --examine -v /dev/sdb1
mdadm: No md superblock detected on /dev/sdb1.
The 4 original devices do contain a superblock :
mdadm --examine -v /dev/sdc1
/dev/sdc1:
Magic : a92b4efc
Version : 1.0
Feature Map : 0x0
Array UUID : 9ee9252c:7eeb7160:fd021026:b68a2612
Name : md/md2
Creation Time : Thu Jan 1 01:00:00 1970
Raid Level : raid5
Raid Devices : 7
Avail Dev Size : 976751872 (465.75 GiB 500.10 GB)
Array Size : 5860511232 (2794.51 GiB 3000.58 GB)
Super Offset : 976751920 sectors
State : clean
Device UUID : e2e95a27:c1d3d21d:2c7f1870:97156b44
Update Time : Sat May 23 03:31:39 2009
Checksum : 2b125ad9 - correct
Events : 1790846
Layout : left-symmetric
Chunk Size : 32K
Array Slot : 1 (failed, 1, failed, 3, 6, 2, 0, 5, 4)
Array State : uUuuuuu 2 failed
Kernel version is 2.6.29-gentoo-r1, mdadm is v2.6.9
Any ideas how i could fix this, or even start the array to get my data off ?
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