Re: [Xen-devel] exception looking up device number f,or hda

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Hi Arun,

I just pulled the latest unstable and could not reproduce.  I have an 
identical scenario (no /dev/hda only /dev/sda due to SATA).
Also, if the devno resolution code fails you should also get a vbd: 
Device not found exception in the logs.  The exception you are seeing is
not actually a problem, it just means that stat has failed.

We should probably cleanup that error message.

Can you post a more complete log file?  I think the error is being 
caused somewhere else.
Thanks,

Anthony Liguori

Arun Sharma wrote:

> Hi Mike,
>
> I have the following line in my config file:
>
> disk = [ 'file:/var/images/min-el3-i386.img,hda,w' ]
>
> and my host doesn't have a /dev/hda (it has a SATA disk which shows up 
> as /dev/sda).
> But I would like the guest to see a /dev/hda. Sounds reasonable?
>
> Now, when I try to create this domain, I get:
>
> [2005-08-05 14:40:53 xend] DEBUG (blkif:24) exception looking up 
> device number for hda: [Errno 2] No such file or directory: '/dev/hda'
> 2005-08-05 14:40:53 xend] DEBUG (blkif:449) Destroying blkif domain=1
> [2005-08-05 14:40:53 xend] DEBUG (blkif:337) Destroying vbd domain=1 id=0
>
> The code in util/blkif.py that tries to convert name to device number 
> doesn't seem to be new, but I don't know why it started showing up 
> suddenly.
> I worked around by manually creating /dev/hda, but I don't think it's 
> reasonable to expect that host's /dev contains entries for all guest 
> devices.
> Also, the effect of having a bad "disk=" line in xmdefconfig (such as 
> pointing to a non-existent file) results in a xend crash. We probably 
> need to add a few checks at the python level so that the user sees a 
> more useful stack trace.
>     -Arun
>
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