Xen users - Apr 2005 - Error creating domain: vbd: Segment not found

Hi list,

I''ve googled and searched the archives but have not found any hint.

After rebooting the host machine I''m getting "Error creating
domain:
vbd: Segment not found" on a formerly working domain:

#> xm create configfile -c
Using config file "configfile".
Error: Error creating domain: vbd: Segment not found: 
uname=file:/root/xeninstanzen/lxgia/lxgia.img

My configfile looks like this:

#> cat configfile
kernel = "/boot/vmlinuz-2.6.10-xenU"
memory = 64
name = "lxgia"
#nics = 1
#ip = "1.2.3.4"
disk = [''file:/root/xeninstanzen/lxgia/lxgia.img,hda6,w'']
root = "/dev/hda6 rw"
dhcp="dhcp"

And the image is still at the right place and could be booted:

#> file /root/xeninstanzen/lxgia/lxgia.img
/root/xeninstanzen/lxgia/lxgia.img: Linux rev 1.0 ext2 filesystem data

As I said, I was able to create this domain before. Since I''m fairly
new
to XEN I don''t really know what to do now. Am I doing something wrong? 
How can I get some more helpful information? How to debug such problems?

Any pointer or hint would be highly appreciated.

Regards,
Gisbert Amm

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Hi,

How many domains do you use? How many are running while trying
to create "lxgia"?
> After rebooting the host machine I''m getting "Error creating
domain:
> vbd: Segment not found" on a formerly working domain:
According to the FAQ, you get this error if your dom0 runs out of
loop-back devices:

"By default, Linux only allows up to 8 loop-back devices to be active.
You can increase this number by setting max_loop=32 (etc) on the
domain 0 kernel command line in Grub."

Greetings,
Christian


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There was no other domain running at all. After rebooting the host 
system another time, the domain comes up again as before. Strange.

However, thank you very much.

Gisbert

Christian Kelinski wrote:
> Hi,
> 
> How many domains do you use? How many are running while trying
> to create "lxgia"?
> 
> 
>>After rebooting the host machine I''m getting "Error
creating domain:
>>vbd: Segment not found" on a formerly working domain:
> 
> According to the FAQ, you get this error if your dom0 runs out of
> loop-back devices:
> 
> "By default, Linux only allows up to 8 loop-back devices to be active.
> You can increase this number by setting max_loop=32 (etc) on the
> domain 0 kernel command line in Grub."
> 
> Greetings,
> Christian
> 
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> After rebooting the host machine I''m getting "Error creating
domain:
> vbd: Segment not found" on a formerly working domain:
> 
> #> xm create configfile -c
> Using config file "configfile".
> Error: Error creating domain: vbd: Segment not found: 
> uname=file:/root/xeninstanzen/lxgia/lxgia.img
> 
> My configfile looks like this:
> 
> #> cat configfile
> kernel = "/boot/vmlinuz-2.6.10-xenU"
> memory = 64
> name = "lxgia"
> #nics = 1
> #ip = "1.2.3.4"
> disk = [''file:/root/xeninstanzen/lxgia/lxgia.img,hda6,w'']
> root = "/dev/hda6 rw"
> dhcp="dhcp"
> 
> And the image is still at the right place and could be booted:
> 
> #> file /root/xeninstanzen/lxgia/lxgia.img
> /root/xeninstanzen/lxgia/lxgia.img: Linux rev 1.0 ext2 filesystem data
> 
> As I said, I was able to create this domain before. Since I''m 
> fairly new to XEN I don''t really know what to do now. Am I 
> doing something wrong? 
> How can I get some more helpful information? How to debug 
> such problems?
As an experiment, please try to use losetup to setup the loop device
manually then use a vbd of ''phy:loopX,hda6,w''.

Adding some debugging to the vbd-file script would be useful too. I
suspect there''s a problem allocating a loop device.

Thanks,
Ian

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