RE: [Xen-devel] Error while creating domains

["Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>]

> Turns out that it is a loop device issue. I was using files 
> as disks for the domains and the default max_loop device in 
> dom0 kernel is 8. Hence I couldn't create more than 8 domains!
> 
> After increasing max_loop to 200, I have been able to create 
> upto 20 domains now (which is enough for now!)
> 
> And yeah, the error was because name argument passed was NULL 
> (in python terms) in /usr/lib/python/xen/util:mount_mode()

It would be good to get the error handling path cleaned up if the block
device script returns an error. Volunteers?

Thanks,
Ian 

> 
> On Tue, Jun 07, 2005 at 11:53:23AM +0100, Ian Pratt wrote:
> > 
> > Add some debugging to print 'name' at the appropraite 
> place. What's the
> > configuration file for this domain.
> > 
> > You might want to use the 'dry run' option just to print 
> out the sxp the
> > domain config has been parsed in to. I suspect the block 
> device name is
> > messed up.
> > 
> > Ian 
> > 
> > > -----Original Message-----
> > > From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx 
> > > [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of 
> > > Srivatsa Vaddagiri
> > > Sent: 07 June 2005 10:40
> > > To: xen-devel@xxxxxxxxxxxxxxxxxxx
> > > Subject: [Xen-devel] Error while creating domains
> > > 
> > > I am trying to start a large number of SMP domains (> 50). 
> > > However, I am unable to create more than 7 domains. When I 
> > > try creating the 8th domain, I get this error:
> > > 
> > > Using config file "myconf7".
> > > VIRTUAL MEMORY ARRANGEMENT:
> > >  Loaded kernel: 0xc0100000->0xc0344c24
> > >  Init. ramdisk: 0xc0345000->0xc0345000
> > >  Phys-Mach map: 0xc0345000->0xc0347800
> > >  Page tables:   0xc0348000->0xc034a000
> > >  Start info:    0xc034a000->0xc034b000
> > >  Boot stack:    0xc034b000->0xc034c000
> > >  TOTAL:         0xc0000000->0xc0400000
> > >  ENTRY ADDRESS: 0xc0100000
> > >  VCPUS:         4
> > > Domain construction error: cannot concatenate 'str' and 
> > > 'NoneType' objects Traceback (most recent call last):
> > >   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> > > 483, in construct
> > >     self.configure()
> > >   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> > > 992, in configure
> > >     self.create_devices()
> > >   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> > > 768, in create_devices
> > >     self.create_configured_devices()
> > >   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> > > 757, in create_configured_devices
> > >     self.createDevice(ctrl_type, dev_config, recreate=recreate)
> > >   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> > > 332, in createDevice
> > >     return ctrl.createDevice(devconfig, recreate=self.recreate)
> > >   File "/usr/lib/python/xen/xend/server/controller.py", line 
> > > 236, in createDevice
> > >     dev.attach(recreate=recreate, change=change)
> > >   File "/usr/lib/python/xen/xend/server/blkif.py", line 
> 221, in attach
> > >     self.setNode(node)
> > >   File "/usr/lib/python/xen/xend/server/blkif.py", line 247, 
> > > in setNode
> > >     mounted_mode = self.check_mounted(node)
> > >   File "/usr/lib/python/xen/xend/server/blkif.py", line 265, 
> > > in check_mounted
> > >     mode = blkif.mount_mode(name)
> > >   File "/usr/lib/python/xen/util/blkif.py", line 73, in mount_mode
> > >     exp = re.compile('^' + name + ' .*[\(,]r(?P<mode>[ow])[,\)]')
> > > TypeError: cannot concatenate 'str' and 'NoneType' objects 
> > > op_create> Exception creating domain:
> > > Traceback (most recent call last):
> > >   File "/usr/lib/python/xen/xend/server/SrvDomainDir.py", 
> > > line 63, in op_create
> > >     dominfo = self.xd.domain_create(config)
> > >   File "/usr/lib/python/xen/xend/XendDomain.py", line 282, in 
> > > domain_create
> > >     dominfo = XendDomainInfo.vm_create(config)
> > >   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> > > 153, in vm_create
> > >     vm.construct(config)
> > >   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> > > 483, in construct
> > >     self.configure()
> > >   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> > > 992, in configure
> > >     self.create_devices()
> > >   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> > > 768, in create_devices
> > >     self.create_configured_devices()
> > >   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> > > 757, in create_configured_devices
> > >     self.createDevice(ctrl_type, dev_config, recreate=recreate)
> > >   File "/usr/lib/python/xen/xend/XendDomainInfo.py", line 
> > > 332, in createDevice
> > >     return ctrl.createDevice(devconfig, recreate=self.recreate)
> > >   File "/usr/lib/python/xen/xend/server/controller.py", line 
> > > 236, in createDevice
> > >     dev.attach(recreate=recreate, change=change)
> > >   File "/usr/lib/python/xen/xend/server/blkif.py", line 
> 221, in attach
> > >     self.setNode(node)
> > >   File "/usr/lib/python/xen/xend/server/blkif.py", line 247, 
> > > in setNode
> > >     mounted_mode = self.check_mounted(node)
> > >   File "/usr/lib/python/xen/xend/server/blkif.py", line 265, 
> > > in check_mounted
> > >     mode = blkif.mount_mode(name)
> > >   File "/usr/lib/python/xen/util/blkif.py", line 73, in mount_mode
> > >     exp = re.compile('^' + name + ' .*[\(,]r(?P<mode>[ow])[,\)]')
> > > TypeError: cannot concatenate 'str' and 'NoneType' objects
> > > Error: Error creating domain: cannot concatenate 'str' and 
> > > 'NoneType' objects
> > > 
> > > 
> > > Is this a bug or a python compatibility issue? FYI, I am 
> > > running this on a 4way Intel box with RHEL4 installed on it. 
> > > I have installed latest (as of 7 June) xen-unstable-src.tgz.
> > > 
> > > 
> > > 
> > > -- 
> > > 
> > > 
> > > Thanks and Regards,
> > > Srivatsa Vaddagiri,
> > > Linux Technology Center,
> > > IBM Software Labs,
> > > Bangalore, INDIA - 560017
> > > 
> > > _______________________________________________
> > > Xen-devel mailing list
> > > Xen-devel@xxxxxxxxxxxxxxxxxxx
> > > http://lists.xensource.com/xen-devel
> > > 
> 
> -- 
> 
> 
> Thanks and Regards,
> Srivatsa Vaddagiri,
> Linux Technology Center,
> IBM Software Labs,
> Bangalore, INDIA - 560017
> 

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