On Thu, 27 Jan 2011, Hank Barta wrote:
Hi,
You may just want to dd and start over; or:
If I try to zero the superblock that seems to be in error, I get:
=============================
root@oak:/var/log# mdadm --zero-superblock /dev/sdb
mdadm: Couldn't open /dev/sdb for write - not zeroing
root@oak:/var/log#
=============================
Have you tried using the partition itself?
/dev/sdb1?
Also, any reason for making partitions on a MD raid device?
[ 16.532107] EXT4-fs (md2p2): bad geometry: block count 485756928
exceeds size of device (483135232 blocks)
This is generally not a good idea.
It sounds like you want to make a raid-1 with two disks and pop it into a
new system?
Way I typically do this is insert both drives into the new system, boot
off a system rescue cd and then create the raid there, boot off the cd
again, with root=/dev/md2, then run LILO, make sure to use 0.90
superblocks.
See below:
USE --assume-clean FOR LARGE FILESYSTEMS so you can reboot directly after
array creation and system restore implantation. (you will want to run an
echo repair > /sys/..sync_action though afterwards)
root@Knoppix:/t/etc# mdadm --create -e 0.90 --verbose /dev/md0 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1
mdadm: size set to 8393856K
mdadm: array /dev/md0 started.
root@Knoppix:/t/etc# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdb1[1] sda1[0]
8393856 blocks [2/2] [UU]
[>....................] resync = 1.4% (120512/8393856) finish=3.4min speed=40170K/sec
root@Knoppix:/t/etc# mdadm --create -e 0.90 --verbose /dev/md1 --level=1 --raid-devices=2 /dev/sda2 /dev/sdb2
mdadm: size set to 136448K
mdadm: array /dev/md1 started.
root@Knoppix:/t/etc#
root@Knoppix:/t/etc# mdadm --create -e 0.90 --verbose /dev/md2 --level=1 --raid-devices=2 /dev/sda3 /dev/sdb3
mdadm: size set to 382178240K
mdadm: array /dev/md2 started.
root@Knoppix:/t/etc#
root@Knoppix:/t/etc# cat /proc/mdstat
Personalities : [raid1]
md2 : active raid1 sdb3[1] sda3[0]
382178240 blocks [2/2] [UU]
resync=DELAYED
md1 : active raid1 sdb2[1] sda2[0]
136448 blocks [2/2] [UU]
resync=DELAYED
md0 : active raid1 sdb1[1] sda1[0]
8393856 blocks [2/2] [UU]
[==========>..........] resync = 51.0% (4283072/8393856) finish=1.0min speed=62280K/sec
unused devices: <none>
root@Knoppix:/t/etc#
After this, you'll need to set them as 0xfd and make sure the boot is bootable,
your LILO config should look something like this:
boot=/dev/md1
root=/dev/md2
map=/boot/map
prompt
delay=100
timeout=100
lba32
vga=normal
append=""
raid-extra-boot="/dev/sda,/dev/sdb" # make boot blocks on both drives
default=2.6.37-3
image=/boot/2.6.37-3
label=2.6.37-3
read-only
root=/dev/md2
Justin.
