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[Xen-devel] File-backed VBDs in 2.0.6?

To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] File-backed VBDs in 2.0.6?
From: Bob Tanner <tanner@xxxxxxxxxxxxx>
Date: Thu, 23 Jun 2005 10:15:09 -0500
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Anyone able to get file-backed VBDs working in 2.0.6 under Debian (both sid or 

I have DOM0 up and running but cannot get any other DOM working -when- using 
file-backed VBDs. Weird part is using LVM-backed VBDs works.

/etc/xen/auto/xen.conf snippets:

# I export the file-backed VBDs like this:
disk = [ 'file:/var/xen/root,hda1,w' ]

# Set root device.
root = "/dev/hda1"

# xm create -c /etc/xen/auto/xen.conf vmid=1
************ REMOTE CONSOLE: CTRL-] TO QUIT ********
Linux version 2.6.11-1-xen2.6.0-d0 (me@xen) (gcc version 3.3.6 (Debian 
1:3.3.6-6)) #1 Tue Jun 21 17:15:50 CDT 2005
Kernel command line:  ip=: root=/dev/hda1
xen_blk: Initialising virtual block device driver
VFS: Cannot open root device "hda1" or unknown-block(0,0)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

Searching the mailing lists there are discussion regarding devfs being the 
problem, and devfs=nomount doesn't fix the problem and you have to unset the 
option in the kernel and recompile.

Tried that and get the same problem of not able to open root device.

Any recommendations on where else to look for more troubleshooting tips?

Bob Tanner <tanner@xxxxxxxxxxxxx>          | Phone : (952)943-8700
http://www.real-time.com, Minnesota, Linux | Fax   : (952)943-8500
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