Re: [Xen-users] Problems with Dell 2850

[Max E Baro <MEB@xxxxxxxxxxxxxxxxx>]

Luke wrote:

> When I try to boot a custom-compiled kernel on a dell 2850, with the

> 4e/di raid controller, i get an error similar to the one found here:

>

> http://www.option-c.com/xwiki/

> Xen_Errors#Kernel_panic:_VFS:_Unable_to_mount_root_fs_on_unknown-

> block.282.2C0.29

>

> about not finding an NFS server.

>

> I'm assuming this is because the Xen kernel can't mount the root

> filesystem for some reason (its ext3).

>

> In the kernel, pulled via mercurial of xen-3.0-testing, all i did was

> enable as modules some iptables stuff, and all the megaraid options as

> modules.

I have 2 2850's running Xen and had a heck of a time getting it to work.  I had to load the megaraid2 drivers from the initrd image to get my system to boot.  When you re-configured it probably changed your initrd.  I manually changed the initrd with the following process:

- Boot from a linux installation CD and choose recovery mode then mount the root file system.

- I copied my initrd to a separate working folder, and then to a backup folder

- expand the initrd.img image with 'gunzip -S .img initrd-2.4.30-xen0.img"

- create a mount point "mkdir /tempfs'

- mount the image using 'mount -o loop initrd-2.4.30-xen0 /tempfs'

- Under the tempfs directory will be the directories for the drivers and a file called rc.init (or init.rc) that loads the drivers and sets the order.

You should be able to fix your image file with this procedure, and copy in any missing drivers.  When completed, just umount /tempfs then re-compress the image with 'gzip -S .img initrd-2.4.30-xen0'.

Good Luck...

Max Baro
Technical Support Representative
FACTS Services, Inc.
(305) 284 - 7440
meb@xxxxxxxxxxxxxxxxx

 

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