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[Xen-devel] bug in starting xen machines - expectation of /dev/sda1 existing on *host*

  • To: xen-devel@xxxxxxxxxxxx
  • From: Luke Kenneth Casson Leighton <lkcl@xxxxxxxx>
  • Date: Thu, 30 Dec 2004 10:49:30 +0000
  • Delivery-date: Thu, 30 Dec 2004 10:40:31 +0000
  • List-id: List for Xen developers <xen-devel.lists.sourceforge.net>


there's a bug in xen 2.0 which can be replicated by installing
udev on the xen master.

if you have udev - and no scsi devices present - on the xen
master, and you specify sda1234 etc as the disk partition
names in the /etc/xen/xen-guest-spec-files, then the xen

... what has the existence or otherwise of /dev/sda1 on the
xen master machine got to do with the guest OSes?

to "fix" this problem, you must cp -aux /.dev/sd* /dev.


[2004-12-29 22:11:16 xend] DEBUG (XendDomainInfo:720) init_domain> Created 
domain=1 name=xenselinuxnfs memory=32
[2004-12-29 22:11:16 xend] INFO (console:92) Created console id=12 domain=1 
[2004-12-29 22:11:17 xend] DEBUG (blkif:146) Connecting blkif 
<BlkifBackendInterface 1 0>
[2004-12-29 22:11:17 xend] INFO (XendRoot:91) EVENT> xend.console.create [12, 
1, 9601]
[2004-12-29 22:11:17 xend] DEBUG (XendDomainInfo:1099) Creating vbd dom=1 
[2004-12-29 22:11:17 xend] DEBUG (blkif:63) exception looking up device number 
for sda1: [Errno 2] No such file or directory: '/dev/sda1'
[2004-12-29 22:11:17 xend] DEBUG (XendDomainInfo:674) Destroying vbds for 
domain 1
[2004-12-29 22:11:17 xend] DEBUG (blkif:541) Destroying blkif domain=1
[2004-12-29 22:11:17 xend] DEBUG (XendDomainInfo:634) Closing console, domain 1
[2004-12-29 22:11:17 xend] DEBUG (XendDomainInfo:622) Closing channel to domain 
[2004-12-29 22:11:17 xend] ERROR (SrvBase:162) op=create: vbd: Device not 
found: sda1
Traceback (most recent call last):
  File "/usr/lib/python2.3/site-packages/twisted/internet/defer.py", line 338, 
in _runCallbacks
    self.result = callback(self.result, *args, **kw)
  File "/lib/python/xen/xend/XendDomainInfo.py", line 975, in <lambda>
    d.addCallback(lambda x: self.create_devices())
  File "/lib/python/xen/xend/XendDomainInfo.py", line 802, in create_devices
    v = dev_handler(self, dev, dev_index)
  File "/lib/python/xen/xend/XendDomainInfo.py", line 1102, in vm_dev_vbd
    defer = ctrl.attachDevice(idx, val, recreate=recreate)
  File "/lib/python/xen/xend/server/blkif.py", line 530, in attachDevice
    dev = self.addDevice(idx, config)
  File "/lib/python/xen/xend/server/blkif.py", line 515, in addDevice
    dev = BlkDev(idx, self, config )
  File "/lib/python/xen/xend/server/blkif.py", line 318, in __init__
  File "/lib/python/xen/xend/server/blkif.py", line 335, in configure
    raise VmError('vbd: Device not found: %s' % self.dev)
VmError: vbd: Device not found: sda1

<a href="http://lkcl.net";>http://lkcl.net</a>

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