Xen users - May 2010 - Starting XEN control daemon: xend failed!

I was running VMs on a Xen machine until yesterday.Some how the system
did not had any memory and all free space was missing.So I free 6 GB.I
have 420 GB separate for VMs.
6GB is free on Dom0.

When ever I am trying to start xend after I boot in

from following grub entries

title           Xen 3.2-1-amd64 / Debian GNU/Linux, kernel 2.6.26-2-xen-amd64
root            (hd0,0)
kernel          /boot/xen-3.2-1-amd64.gz dom0_mem=500Mb
module          /boot/vmlinuz-2.6.26-2-xen-amd64 root=/dev/sda1 ro console=tty0
module          /boot/initrd.img-2.6.26-2-xen-amd64


if I do /etc/init.d/xend start
it gives error
Starting XEN control daemon: xend failed!
What should I look in,
what probably might be reason.

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On Tue, May 11, 2010 at 2:13 PM, Tapas Mishra <mightydreams@gmail.com>
wrote:
> if I do /etc/init.d/xend start
> it gives error
> Starting XEN control daemon: xend failed!
> What should I look in,
/var/log/messages, /var/log/daemon.log, and /var/log/xen/xend.log
should give an idea what''s wrong. Look for several latest entries.

-- 
Fajar

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Okay
I looked at /var/log/messages
this message
Unable to start blktapctrl
has repeated many times.

in fact
in /var/log/daemon.log has following repeated
BLKTAPCTRL[4984]: Unable to start blktapctrl
~

then /var/log/xen/xend.log
[2010-04-29 06:38:22 3305] ERROR (XendDomain:1136) Restore failed
Traceback (most recent call last):
  File "/usr/lib/xen-3.2-1/lib/python/xen/xend/XendDomain.py", line
1134, in domain_restore_fd
    return XendCheckpoint.restore(self, fd, paused=paused)
  File "/usr/lib/xen-3.2-1/lib/python/xen/xend/XendCheckpoint.py",
line 239, in restore
    forkHelper(cmd, fd, handler.handler, True)
  File "/usr/lib/xen-3.2-1/lib/python/xen/xend/XendCheckpoint.py",
line 361, in forkHelper
    raise XendError("%s failed" % string.join(cmd))
XendError: /usr/lib/xen-3.2-1/bin/xc_restore 4 4 1 2 0 0 0 failed


So I feel that BLKTAPCTRL is causing error I know what blktap is but
here how to proceed?

On Tue, May 11, 2010 at 12:45 PM, Fajar A. Nugraha <fajar@fajar.net>
wrote:
> On Tue, May 11, 2010 at 2:13 PM, Tapas Mishra
<mightydreams@gmail.com> wrote:
>> if I do /etc/init.d/xend start
>> it gives error
>> Starting XEN control daemon: xend failed!
>> What should I look in,
>
> /var/log/messages, /var/log/daemon.log, and /var/log/xen/xend.log
> should give an idea what''s wrong. Look for several latest entries.
>
> --
> Fajar
>


-- 
Tapas

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In fact in one more file xend-debug.log
Following message was there
IOError: [Errno 28] No space left on device


but after I deleted 6 GB space from Dom0
if I am restarting then in addition to the error messages I mentioned
above I also get following

Xend started at Tue May 11 12:46:50 2010.
Exception starting xend: no element found: line 1, column 0


On Tue, May 11, 2010 at 12:57 PM, Tapas Mishra <mightydreams@gmail.com>
wrote:
> Okay
> I looked at /var/log/messages
> this message
> Unable to start blktapctrl
> has repeated many times.
>
> in fact
> in /var/log/daemon.log has following repeated
> BLKTAPCTRL[4984]: Unable to start blktapctrl
> ~
>
> then /var/log/xen/xend.log
> [2010-04-29 06:38:22 3305] ERROR (XendDomain:1136) Restore failed
> Traceback (most recent call last):
>  File "/usr/lib/xen-3.2-1/lib/python/xen/xend/XendDomain.py",
line
> 1134, in domain_restore_fd
>    return XendCheckpoint.restore(self, fd, paused=paused)
>  File "/usr/lib/xen-3.2-1/lib/python/xen/xend/XendCheckpoint.py",
> line 239, in restore
>    forkHelper(cmd, fd, handler.handler, True)
>  File "/usr/lib/xen-3.2-1/lib/python/xen/xend/XendCheckpoint.py",
> line 361, in forkHelper
>    raise XendError("%s failed" % string.join(cmd))
> XendError: /usr/lib/xen-3.2-1/bin/xc_restore 4 4 1 2 0 0 0 failed
>
>
> So I feel that BLKTAPCTRL is causing error I know what blktap is but
> here how to proceed?
>
> On Tue, May 11, 2010 at 12:45 PM, Fajar A. Nugraha <fajar@fajar.net>
wrote:
>> On Tue, May 11, 2010 at 2:13 PM, Tapas Mishra
<mightydreams@gmail.com> wrote:
>>> if I do /etc/init.d/xend start
>>> it gives error
>>> Starting XEN control daemon: xend failed!
>>> What should I look in,
>>
>> /var/log/messages, /var/log/daemon.log, and /var/log/xen/xend.log
>> should give an idea what''s wrong. Look for several latest
entries.
>>
>> --
>> Fajar
>>
>
>
>
> --
> Tapas
>


-- 
Tapas

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On Tue, May 11, 2010 at 3:02 PM, Tapas Mishra <mightydreams@gmail.com>
wrote:
> In fact in one more file xend-debug.log
> Following message was there
> IOError: [Errno 28] No space left on device
That''s ... not good :P
>
>
> but after I deleted 6 GB space from Dom0
> if I am restarting then in addition to the error messages I mentioned
> above I also get following
>
> Xend started at Tue May 11 12:46:50 2010.
> Exception starting xend: no element found: line 1, column 0
>
it''s possible hat due to lack of space, xen tools was not compiled or
installed correctly. I suggest you at least reinstall xen, and try
again.
> On Tue, May 11, 2010 at 12:57 PM, Tapas Mishra
<mightydreams@gmail.com> wrote:
>> Okay
>> I looked at /var/log/messages
>> this message
>> Unable to start blktapctrl
>> has repeated many times.
What happens when you start blktapctrl manually?

-- 
Fajar

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