Hi all. Please excuse, newbie here, finding out how much I don't know
about md.
I have a RAID1 array which is running in degraded mode. When I try to
re-add the device that used to be part of the array, I'm told that it's
too small, though it used to be fine.
/proc/mdstat:
md1 : active raid1 sdc3[2]
2920305508 blocks super 1.0 [2/1] [_U]
When I try to re-add the device that used to be part of the array, mdadm
says it's not large enough:
# mdadm --add /dev/md1 /dev/sdb3
mdadm: /dev/sdb3 not large enough to join array
The partition tables hadn't changed when this started. Since then I've
re-partitioned sdb to make sdb3 a few GB bigger, but it's still not
large enough.
Looking at the working device's superblock, there's a heap of "failed"
so I'm guessing that superblock has been damaged:
# mdadm -E /dev/sdc3
/dev/sdc3:
Magic : a92b4efc
Version : 1.0
Feature Map : 0x0
Array UUID : 129ec25f:f07e292a:5bf0829d:19793e6c
Name : pioneer:1 (local to host pioneer)
Creation Time : Thu Nov 21 21:19:12 2013
Raid Level : raid1
Raid Devices : 2
Used Dev Size : 5841405976 (2785.40 GiB 2990.80 GB)
Array Size : 5840611016 (2785.02 GiB 2990.39 GB)
Used Size : 5840611016 (2785.02 GiB 2990.39 GB)
Super Offset : 5841406232 sectors
State : clean
Device UUID : 6bbc382c:244cf1ad:4fd61c87:4e40e592
Update Time : Fri Jun 13 17:05:57 2014
Checksum : 93cf5353 - correct
Events : 444384
Array Slot : 2 (failed, failed, 1, failed, failed, failed, failed,
failed, failed, failed, failed, failed, failed, failed, failed, failed,
failed, failed, failed, failed, failed, failed, failed, failed, failed,
failed, failed, failed, failed, failed, failed, failed, failed, failed,
[snip]
failed) Array State : _U 383 failed
Could it be that whatever happened to the superblock on sdc3 is giving
it an incorrect idea of the array size? Is that something I can fix?
Would I be better off creating a new array on sdb3+missing and copying
data to that? Then I would zero the superblock on sdc3 and hopefully
add it to the new array.
Would appreciate any help.
Thanks. Pete
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