OK, this is bizarre:
Backup:/# mdadm -G -v -n 10 --backup-file=/GrowRAID.fil /dev/md0
mdadm: Need to backup 4503599627313152K of critical section..
mdadm: /dev/md0: Something wrong - reshape aborted
A 4 Million Terabyte critical section? I don't think so. This isn't the
first time the array have been grown - indeed it has been grown quite a few
times. It is, however, the first time the array has been grown since
upgrading to mdadm 3.1.2 and kernel 2.6.32-3 on this machine. Did I forget
something on the command line? The CV:
Backup:~# mdadm -D /dev/md0
/dev/md0:
Version : 1.2
Creation Time : Mon May 31 16:23:10 2010
Raid Level : raid6
Array Size : 10255960064 (9780.85 GiB 10502.10 GB)
Used Dev Size : 1465137152 (1397.26 GiB 1500.30 GB)
Raid Devices : 9
Total Devices : 10
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Sat Jul 17 16:34:57 2010
State : active
Active Devices : 9
Working Devices : 10
Failed Devices : 0
Spare Devices : 1
Layout : left-symmetric
Chunk Size : 1024K
Name : Backup:0 (local to host Backup)
UUID : 431244d6:45d9635a:e88b3de5:92f30255
Events : 132701
Number Major Minor RaidDevice State
0 8 0 0 active sync /dev/sda
1 8 16 1 active sync /dev/sdb
2 8 32 2 active sync /dev/sdc
3 8 48 3 active sync /dev/sdd
4 8 64 4 active sync /dev/sde
5 8 80 5 active sync /dev/sdf
6 8 96 6 active sync /dev/sdg
7 8 112 7 active sync /dev/sdh
8 8 128 8 active sync /dev/sdi
9 8 144 - spare /dev/sdj
Backup:~# mdadm --examine /dev/sdj
/dev/sdj:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x1
Array UUID : 431244d6:45d9635a:e88b3de5:92f30255
Name : Backup:0 (local to host Backup)
Creation Time : Mon May 31 16:23:10 2010
Raid Level : raid6
Raid Devices : 9
Avail Dev Size : 2930275120 (1397.26 GiB 1500.30 GB)
Array Size : 20511920128 (9780.85 GiB 10502.10 GB)
Used Dev Size : 2930274304 (1397.26 GiB 1500.30 GB)
Data Offset : 2048 sectors
Super Offset : 8 sectors
State : clean
Device UUID : 70ebdc42:491186dc:0e72e7ef:504363af
Internal Bitmap : 8 sectors from superblock
Update Time : Sat Jul 17 16:35:06 2010
Checksum : 640783ec - correct
Events : 132703
Layout : left-symmetric
Chunk Size : 1024K
Device Role : spare
Array State : AAAAAAAAA ('A' == active, '.' == missing)
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