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Frantic

Member

Registered: 2009-01-22

Posts: 32

[solved] Trouble booting from ext4 on software raid5

I have 3 disks, each partitioned as:
1 - 100MB for /boot, ext3,
2 - 8000MB swap,
3 - rest for /, ext4

mdadm --create /dev/md0 --level=5 /dev/sd{a,b,c}3 (root raid 5)
mdadm --create /dev/md2 --level=0 /dev/sd{a,b,c}2 (swap raid 0)

I was planning to use raid1 on md1 for sd{a,b,c}1 for boot as I understand it's supported, but couldn't get it to work at all.
So I decided I will skip this part for now and check back later.
So now I have / on /dev/md0 and /boot on /dev/sda1.

My kernel line from /boot/grub/menu.lst looks like:
(ofcourse I have rebuilt the kernel image since then)

kernel /vmlinuz26 md=0,/dev/sda3,/dev/sdb3,/dev/sdc3 rootfstype=ext4 root=/dev/md0 ro

What I have edited in mkinitcpio.conf is:

MODULES="raid0 raid1 raid456"
HOOKS="base raid udev autodetect pata scsi sata filesystems"

I reboot, grub starts, kernel loads, then I get:

Waiting 0 s before mounting root device...
md: Will configure md0 (super-block) from /dev/sda3,/dev/sdb3,/dev/sdc3, below.
EXT4-fs: unable to read superblock
kinit: Unable to mount root fs on device md0(9,0)
kinit: init not found!
Kernel panic - not syncing: Attempted to kill init!

However, I have rebooted to the arch live cd, and I can assemble the array and mount the volume, here is how I mount it:

mdadm --assemble /dev/md0 /dev/sd{a,b,c}3
mount -t ext4 /dev/md0 /mnt

Does anyone have any idea why this is not working?
Are there any other weird kernel params that I'm missing? (like rootfstype)
(btw, if I remove rootfstype I get the exact same thing without the EXT4-fs... line)

Last edited by Frantic (2009-03-03 17:54:34)

xaiviax

Member

From: Michigan

Registered: 2008-11-04

Posts: 282

Re: [solved] Trouble booting from ext4 on software raid5

In HOOKS="base raid udev autodetect pata scsi sata filesystems", move raid between sata and filesystems

Frantic

Member

Registered: 2009-01-22

Posts: 32

Re: [solved] Trouble booting from ext4 on software raid5

THANK YOU!!

[solved]