RE: Hotplug scripts not working... xen/ia64 domU stopped working

[David F Barrera <dfbp@us.ibm.com>]

I wonder if what I am seeing is the same problem described in this
thread. I am unable to create domUs on an x86_64 box, something which I
had been able to do even this morning:

VmError: Device 2070 (vbd) could not be connected. Backend device not
found.

[2005-12-02 15:11:25 xend] DEBUG (DevController:119) Waiting for devices
vif.
[2005-12-02 15:11:25 xend] DEBUG (DevController:125) Waiting for 0.
[2005-12-02 15:11:25 xend] DEBUG (DevController:398)
hotplugStatusCallback /local/domain/0/backend/vif/1/0/hotplug-status.
[2005-12-02 15:11:25 xend] DEBUG (DevController:398)
hotplugStatusCallback /local/domain/0/backend/vif/1/0/hotplug-status.
[2005-12-02 15:11:25 xend] DEBUG (DevController:415)
hotplugStatusCallback 1.
[2005-12-02 15:11:25 xend] DEBUG (DevController:119) Waiting for devices
usb.
[2005-12-02 15:11:25 xend] DEBUG (DevController:119) Waiting for devices
vbd.
[2005-12-02 15:11:25 xend] DEBUG (DevController:125) Waiting for 2070.
[2005-12-02 15:11:25 xend] DEBUG (DevController:398)
hotplugStatusCallback /local/domain/0/backend/vbd/1/2070/hotplug-
status.[2005-12-02 15:11:25 xend] DEBUG (DevController:415)
hotplugStatusCallback 3.
[2005-12-02 15:11:25 xend] ERROR (SrvBase:87) Request wait_for_devices
failed.
Traceback (most recent call last):
  File "/tmp/xen-
unstable.hg/dist/install/usr/lib64/python/xen/web/SrvBase.py", line 85,
in perform
    return op_method(op, req)
  File "/tmp/xen-
unstable.hg/dist/install/usr/lib64/python/xen/xend/server/SrvDomain.py",
line 72, in op_wait_for_devices
    return self.dom.waitForDevices()
  File "/tmp/xen-
unstable.hg/dist/install/usr/lib64/python/xen/xend/XendDomainInfo.py",
line 1276, in waitForDevices
    self.waitForDevices_(c)
  File "/tmp/xen-
unstable.hg/dist/install/usr/lib64/python/xen/xend/XendDomainInfo.py",
line 923, in waitForDevices_
    return self.getDeviceController(deviceClass).waitForDevices()
  File "/tmp/xen-
unstable.hg/dist/install/usr/lib64/python/xen/xend/server/DevController.py", line 121, in waitForDevices
    return map(self.waitForDevice, self.deviceIDs())
  File "/tmp/xen-
unstable.hg/dist/install/usr/lib64/python/xen/xend/server/DevController.py", line 137, in waitForDevice
    raise VmError("Device %s (%s) could not be connected. "
VmError: Device 2070 (vbd) could not be connected. Backend device not
found.


On Fri, 2005-12-02 at 12:40 -0800, Magenheimer, Dan (HP Labs Fort
Collins) wrote:
> > Anyway, I'd be inclined to try the new changesets (not yet 
> > pushed to the public
> > tree) and see if that improves things. 
> 
> Same problem and same workaround on tip (8169).  Please
> email when your new changesets get pushed and I will
> try them.
> 
> > > My /etc/xen/xmdefconfig is very short:
> > > kernel = "/tmp/xenlinux"
> > > memory = 256
> > > nics=0
> > > disk = ['phy:loop0,hda1,w']  # <-change to w!
> > > 
> > > and after a fresh boot, I am simply doing:
> > > 
> > > # lomount -t ext2 -diskimage /var/xen/hda /mnt
> > > # xend start
> > > # xm create
> > > 
> > > I can see how it could be interpreted that loop0 is
> > > being used both by domain0 and the newly created domain,
> > > but isn't this a common use model?
> > 
> > Only if you want to corrupt your filesystem!  Writing to that 
> > file via /mnt
> > in dom0 and via /dev/hda1 in the guest ought to corrupt your 
> > fs nicely.
> 
> Not as long as the image is only used from domU, correct?
> 
> What is the proper use model?  As I noted previously,
> disk = ['file:/var/xen/hda,hda1,w'] results in a Linux
> error message ("UDF-fs: No VRS found"... and, no, I do
> not have any CD's in /etc/fstab!).  Am I spelling
> this xmdefconfig entry incorrectly?  Or is there
> a better way to use a disk-in-a-file as root disk for
> a guest domain?
> 
> Thanks,
> Dan
> 
> _______________________________________________
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> 
-- 
Regards,

David F Barrera
Linux Technology Center
Systems and Technology Group, IBM

"The wisest men follow their own direction. "
                                                        Euripides