Re: [Xen-devel] Error while creating domains

[Srivatsa Vaddagiri <vatsa@xxxxxxxxxx>]

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()


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

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel