Re: [Xen-devel] bug in starting xen machines - expectation of /dev/sda1 existing on *host*

[Milan Holzäpfel <lists@xxxxxxxx>]

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On Thu, 30 Dec 2004 10:49:30 +0000
Luke Kenneth Casson Leighton <lkcl@xxxxxxxx> wrote:

> [...]
> 
> ... what has the existence or otherwise of /dev/sda1 on the
> xen master machine got to do with the guest OSes?

Xend does a stat on /dev/<dev-to-be-used-in-xenU-domain> to find the
device numbers (which the virtual block device driver is then providing
inside the xenU-domain.)  

But since you usually are likely to have either an IDE or an SCSI hard
disk, you should be able to use hda1 instead.  I'd guess that the only
difference between sda1 and hda1 with respect to the virtual block
device driver should be the device number, isn't it?

On the other hand, this finding out aboud device name <-> number mapping
is probably not very elegant, but simple.  Anyone familiar with Python
may fix it in the file site-packages/xen/xend/server/blkif.py; probably
modifying the function "blkdev_name_to_number" at the top.

> [...]
>   File "/lib/python/xen/xend/server/blkif.py", line 335, in configure
>     raise VmError('vbd: Device not found: %s' % self.dev)
> VmError: vbd: Device not found: sda1

(on your setup, /lib/python/xen/xend/server/blkif.py is the exact path
to that file; usually the xen directory is
/usr/lib/python2.3/site-packages.)

Regards,
Milan

PS: Sorry for sending it to only to you, Luke, I forgot to change the
recipient...

- -- 

                   Milan Holzäpfel alias jagdfalke alias jag

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