On Wed Dec 07, 2011 at 03:38:05PM -0700, Richard B. Pyne 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 raid and most of the documentation I can find is severely outdated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.
>
>
I've been bitten by this one myself recently. I suspect you've failed to
copy over the required underlying /dev entries. You need at least
/dev/console and /dev/null on the rootfs - at this stage the tmpfs
hasn't been mounted on /dev and udev hasn't created all the dev nodes.
Cheers,
Robin
--
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( ' } | Robin Hill <robin@xxxxxxxxxxxxxxx> |
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