Greets,
I currently try to re-add 2 disks to a RAID6 array.
There were 4 disks in a Fujitsu Q800 NAS, the RAID6 was done via WebGUI.
2 disks have been removed from the array and I am not able to re-add the
old disks or add new disks via WebGUI.
The support told me to "re-insert disks, if it doesn't work, rebuild
array" ... cool. What do I need a RAID for then ??
Anway.
Entered hacking mode ;-) at least in my terms.
sshed into box.
To get it short:
Currently the RAID6 array /dev/md0 is:
md0 : active raid6 sdc3[2] sdd3[3]
3903891200 blocks level 6, 64k chunk, algorithm 2 [4/2] [__UU]
So I would like to re-add sda3 and sdb3 ...
I get:
# mdadm /dev/md0 -a /dev/sda3
mdadm: /dev/sda3 not large enough to join array
oops!
But the comparison shows:
[~] # fdisk -l /dev/sda
Disk /dev/sda: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 1 66 530125 83 Linux
/dev/sda2 67 132 530142 83 Linux
/dev/sda3 133 243138 1951945693 83 Linux
/dev/sda4 243139 243200 498012 83 Linux
[~] # fdisk -l /dev/sdc
Disk /dev/sdc: 2000.3 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdc1 1 66 530125 83 Linux
/dev/sdc2 67 132 530142 83 Linux
/dev/sdc3 133 243138 1951945693 83 Linux
/dev/sdc4 243139 243200 498012 83 Linux
-> identical partitions
---
Could that relate to this issue:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=500309
The NAS seems to run some ubuntu:
# cat /proc/version
Linux version 2.6.33.2 (root@NasX86-5) (gcc version 4.1.3 20070929
(prerelease) (Ubuntu 4.1.2-16ubuntu2)) #1 SMP Mon Sep 13 04:28:32 CST 2010
and brings an older mdadm:
# mdadm --version
mdadm - v2.6.3 - 20th August 2007
If that is the issue, is there a way to use some newer binary (magically
transferred to me by mail or URL ;-) ) of mdadm to re-add disks?
I would really really like to avoid to rebuild that array ...
Thanks in advance, looking forward to your hints, Stefan!
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