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

["M.A. Williamson" <maw48@xxxxxxxxx>]

This is a known limitation... :-(

> ... what has the existence or otherwise of /dev/sda1 on the
> xen master machine got to do with the guest OSes?
In order to create the guest, Xend needs to look up the major / minor for 
the device name in the guest you specified. It has to do this on dom0's 
filesystem, so if there isn't a /dev/sda1 there it'll fail.
The current workaround is to specify the device number explicitly (e.g. 
phy:0801 should work for /dev/sda1).
The long-term fix would be to include a table for Xend to generate device 
numbers from, thus eliminating the dependency on these nodes existing in 
dom0.
HTH,
Mark

> to "fix" this problem, you must cp -aux /.dev/sd* /dev.
>
> l.
>
> [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 port=9601 [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 uname=phy:/dev/hda17 [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 1 [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__
>     self.configure(config)
>   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

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