On 12/7/2011 4:01 PM, Mathias Burén wrote:
On 7 December 2011 22:38, Richard B. Pyne<rpyne@xxxxxxxxxxx> wrote:
Please forgive me if I ask stupid questions, I am fairly new to linux raid
and most of the documentation I can find is severely outdated and/or written
for someone who already understands linux raid.
I have successfully built a set raid 6 array with 4 drives and have copied
my system partitions onto the raid drives. I then reboot with root=/dev/md0.
Everything looks like it is working right up through:
md/raid:md0 raid level 6 active with 4 out of 4 devices, algorithm 2
md0: detected capacity change from 0 to 1000131788
md: autorun DONE.
md0: unknown partition table
EXT3-fs (md0): error: couldn't mount because of unsupported optional
features
EXT2-fs (md0): error: couldn't mount because of unsupported optional
features
EXT4-fs (md0): mounted filesystem with ordered data mode. Opts: (null)
VFS: Mounted root (ext4 filesystem) readonly on device 9:0.
freeing unused kernel memory: 472k freed
at which point it just hangs. No more disk access, no more messages.
The system has 5 WD Caviar Black 500GB drives. I did the linux install on
the first drive and built the other 4 drives into the raid system, planning
to move everything (except the /boot partition) on to the raid array and
then repartition everything except the /boot partition on the first drive
and add it to the raid.
I currently have md0 for / md1 for /home md2 for /usr md3 for /var and md4
on which I plan on running lvm to allocate to other system needs.
Any advice, insights and/or direction will be greatly appreciated.
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So you created 1 RAID6 volume. That is now "1 RAID drive", i.e. md0.
Did you create partitions on md0? Or did you make it a physical volume
(PV) with LVM?
I guess I should have been a bit more clear. Each drive is partitioned
with 7 partitions. 1,2,3,5,6,7&8. partition 1 is just a small partition
to match the original boot drive /boot partition. Partition 2 is swap
space. partition 3 has been made into md0 and formatted with an ext4 for
/, same for partitions 5 as md1 for /home, partition 6 as md2 for /usr
and partition 7 as md3 for /var. Once I have everything up and working,
then I will put lvm on md4 made from partition 8 and use it for other
server needs.
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