Xen users - Sep 2007 - Error: Device 2049 (vbd) could not be connected. - again after reboot

It''s very strange. I thought I had solved the problem with xen and the 
not starting domU yesterday but now I see the same error as yesterday 
again only after a reboot an I''ve changed nothing, only iptables.
I don''t have an answer for that behaivior.

server1:/etc/xen# xm create -c xen-etch.cfg
Using config file "xen-etch.cfg".
Error: Device 2049 (vbd) could not be connected. Backend device not found.
h966380:/etc/xen# ifconfig
???


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I hope I got it now. It seems that it needs somthing like "loop 
max_loop=64" to /etc/modules to load the loop module to the kernel.

What does "max_loop" mean?

Frank

Frank schrieb:
> It''s very strange. I thought I had solved the problem with xen and
the
> not starting domU yesterday but now I see the same error as yesterday 
> again only after a reboot an I''ve changed nothing, only iptables.
> I don''t have an answer for that behaivior.
> 
> server1:/etc/xen# xm create -c xen-etch.cfg
> Using config file "xen-etch.cfg".
> Error: Device 2049 (vbd) could not be connected. Backend device not found.
> h966380:/etc/xen# ifconfig
> ???
> 
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
> 
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On Sat, Sep 01, 2007 at 12:37:57PM +0200, Frank wrote:
> I hope I got it now. It seems that it needs somthing like "loop 
> max_loop=64" to /etc/modules to load the loop module to the kernel.
> 
> What does "max_loop" mean?
According to linux-kernelsource/drivers/block/loop.c its the
number of loop-devices that can be used with the driver.
A default of 8 is compiled in.


Christian

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But why than there are problems with the loop devices with xen if 8 is 
compiled in. I only unsed 2 img files as loop device and got this error
"Error: Device 2049 (vbd) could not be connected. Backend device not
found."
After I added "loop max_loop=64" the error was gone.

 > According to linux-kernelsource/drivers/block/loop.c its the
 > number of loop-devices that can be used with the driver.
 > A default of 8 is compiled in.
 >
 >
 > Christian
Frank schrieb:
> I hope I got it now. It seems that it needs somthing like "loop 
> max_loop=64" to /etc/modules to load the loop module to the kernel.
> 
> What does "max_loop" mean?
> 
> Frank
> 
> Frank schrieb:
>> It''s very strange. I thought I had solved the problem with xen
and the
>> not starting domU yesterday but now I see the same error as yesterday 
>> again only after a reboot an I''ve changed nothing, only
iptables.
>> I don''t have an answer for that behaivior.
>>
>> server1:/etc/xen# xm create -c xen-etch.cfg
>> Using config file "xen-etch.cfg".
>> Error: Device 2049 (vbd) could not be connected. Backend device not 
>> found.
>> h966380:/etc/xen# ifconfig
>> ???
>>
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@lists.xensource.com
>> http://lists.xensource.com/xen-users
>>
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
> 
_______________________________________________
Xen-users mailing list
Xen-users@lists.xensource.com
http://lists.xensource.com/xen-users

Frank wrote:
> But why than there are problems with the loop devices with xen if 8 is 
> compiled in. I only unsed 2 img files as loop device and got this error
> "Error: Device 2049 (vbd) could not be connected. Backend device not
> found."
> After I added "loop max_loop=64" the error was gone.
Stopping and restarting domains can leave loop connections dangling in 
fascinating ways: and if you''re using file-based DomU''s, *each
disk or
partition in the devices for the Xen config file* is an additional 
loopback point.

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How can I show all used loop devices on debian?

Frank schrieb:
> But why than there are problems with the loop devices with xen if 8 is 
> compiled in. I only unsed 2 img files as loop device and got this error
> "Error: Device 2049 (vbd) could not be connected. Backend device not
> found."
> After I added "loop max_loop=64" the error was gone.
> 
>  > According to linux-kernelsource/drivers/block/loop.c its the
>  > number of loop-devices that can be used with the driver.
>  > A default of 8 is compiled in.
>  >
>  >
>  > Christian
> Frank schrieb:
>> I hope I got it now. It seems that it needs somthing like "loop 
>> max_loop=64" to /etc/modules to load the loop module to the
kernel.
>>
>> What does "max_loop" mean?
>>
>> Frank
>>
>> Frank schrieb:
>>> It''s very strange. I thought I had solved the problem with
xen and
>>> the not starting domU yesterday but now I see the same error as 
>>> yesterday again only after a reboot an I''ve changed
nothing, only
>>> iptables.
>>> I don''t have an answer for that behaivior.
>>>
>>> server1:/etc/xen# xm create -c xen-etch.cfg
>>> Using config file "xen-etch.cfg".
>>> Error: Device 2049 (vbd) could not be connected. Backend device not
>>> found.
>>> h966380:/etc/xen# ifconfig
>>> ???
>>>
>>>
>>> _______________________________________________
>>> Xen-users mailing list
>>> Xen-users@lists.xensource.com
>>> http://lists.xensource.com/xen-users
>>>
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@lists.xensource.com
>> http://lists.xensource.com/xen-users
>>
> 
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
> 
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