Xen users - Aug 2006 - DomU (CentOS) on Dom0 (Debian) can''t find /sys/block/sda/dev

Hi,

I''m running Debian Etch (unstable) as my host OS on AMD64 architecture,
and I''ve installed Dom0 without many problems.  I''m trying to
boot a
CentOS4 DomU (as a logical volume) without much success.  The following
is the output to standard out including a few lines before errors begin:

pci_hotplug: PCI Hot Plug PCI Core version: 0.5
shpchp: Standard Hot Plug PCI Controller Driver version: 0.4
SCSI subsystem initialized
3ware 9000 Storage Controller device driver for Linux v2.26.02.007.
register_blkdev: cannot get major 8 for sd
/bin/cat: /sys/block/sda/dev: No such file or directory
Waiting 1 seconds for /sys/block/sda/dev to show up
/bin/cat: /sys/block/sda/dev: No such file or directory
Waiting 2 seconds for /sys/block/sda/dev to show up
/bin/cat: /sys/block/sda/dev: No such file or directory
Waiting 4 seconds for /sys/block/sda/dev to show up
/bin/cat: /sys/block/sda/dev: No such file or directory
Waiting 8 seconds for /sys/block/sda/dev to show up
/bin/cat: /sys/block/sda/dev: No such file or directory
Waiting 16 seconds for /sys/block/sda/dev to show up
/bin/cat: /sys/block/sda/dev: No such file or directory
Device /sys/block/sda/dev seems to be down.
Debugging opportunity, type ^D to continue.
/bin/dash: can''t access tty; job control turned off
#

I''ve been unable to do anything promising with the debugging
opportunity.  I''ve tried configuring DomU with both the xen-tools
package, and manually.
The following is my DomU config file at /etc/xen/test.cfg:

kernel  = ''/boot/vmlinuz-2.6.16-2-xen-amd64-k8''
ramdisk = ''/boot/initrd.img-2.6.16-xen''
memory  = ''96''
root    = ''/dev/sda1 ro''
disk    = [ ''phy:Debian/test-disk,sda1,w'',
            ''phy:Debian/test-swap,sda2,w'' ]
name    = ''test''
vif  = [ ''ip=10.1.2.115'' ''bridge=xenbr0'' ]
on_poweroff = ''destroy''
on_reboot   = ''restart''
on_crash    = ''restart''

I haven''t found anything useful on Google, although I did find a few
people with the same problem.
I would appreciate any suggestions on how to get my DomU to boot, or
requests for more information.

______________
Mike Morris
mike@datdec.com


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Michael Morris wrote:
> register_blkdev: cannot get major 8 for sd
> /bin/cat: /sys/block/sda/dev: No such file or directory
> Waiting 1 seconds for /sys/block/sda/dev to show up
> [..]
> I would appreciate any suggestions on how to get my DomU to boot, or
> requests for more information.
May it be that your domU uses yaird as initrd creator? I can remember that I
had simmilar problems when trying unmodified yaird for the first time.
I''ve
created a custom domU yaird config and template. 
I can post them if you use yaird. 

Greetings, Markus


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On Fri, 11 Aug 2006, Markus Schuster wrote:
> Michael Morris wrote:
> > register_blkdev: cannot get major 8 for sd
> > /bin/cat: /sys/block/sda/dev: No such file or directory
> > Waiting 1 seconds for /sys/block/sda/dev to show up
> > [..]
> > I would appreciate any suggestions on how to get my DomU to boot, or
> > requests for more information.
> 
> May it be that your domU uses yaird as initrd creator? I can remember that
I
> had simmilar problems when trying unmodified yaird for the first time.
I''ve
> created a custom domU yaird config and template. 
> I can post them if you use yaird. 
I would expect it was the incomplete path to his image files.
> disk    = [ ''phy:Debian/test-disk,sda1,w'',
>            ''phy:Debian/test-swap,sda2,w'' ]
but I could be wrong. I would spec the full path /somedir/Debian/test-disk 
etc...

He shouldn''t need an initrd if he just makes sure he''s got a
few minimal
files in /dev/ (e.g. console zero null and maybe his sda devices .... e.g. 
enough for the system to get udev up and running). Personally I try to 
avoid anything that complicates things, and that is especially true of 
boot processes... so unless I _need_ an initrd, I avoid them ... but some 
boot processes require it (like nbd/AOE which require user-space help). 


-Tom
> 
> Greetings, Markus
> 
> 
> _______________________________________________
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> 
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