RE: [Xen-users] Max Number of Domains

["Peter Ranson" <peter.ranson@xxxxxxxxxxxxxxx>]

Hi,

 

Thanks for the response. So after a little more digging, I find this in the xend error log

 

[2011-03-02 12:24:51 xend.XendDomainInfo 4324] ERROR (XendDomainInfo:219) Domain construction failed

Traceback (most recent call last):

  File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py", line 211, in create

    vm.construct()

  File "/usr/lib64/python2.4/site-packages/xen/xend/XendDomainInfo.py", line 1805, in construct

    hvm = hvm)

Error: (12, 'Cannot allocate memory')

 

Strange thing is that Dom0 has loads of memory free, as does the box. What I do find interesting is that the box is currently using 32GB of RAM …. I read somewhere that Xen only recognizes 32GB?

 

From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Carlos
Sent: Wednesday, March 02, 2011 12:15 PM
To: Peter Ranson
Cc: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] Max Number of Domains

 

Try this.

http://wiki.xensource.com/xenwiki/XenFaq

4.4. When I start a 9th domain using a loop-back file as its virtual disk why do I get "Error: vbd: Segment not found: uname=file:/path/to/image"?
By default, Linux only allows up to 8 loop-back devices to be active. You can increase this number by setting max_loop=32 (etc) on the domain 0 kernel command line in Grub. You also need to create new loop[n] device nodes in /dev.

2011/3/2 Peter Ranson <peter.ranson@xxxxxxxxxxxxxxx>

I am having a problem starting the 41^st domain on a host of mine. It simply will not start, but when I shut down an existing one, then it will boot up fine, so there appears to be a limit on the number that can run at a time. Im running xen 3.2 currently.

 

Any ideas?

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