[CentOS] xen - 4 concurrent virtual DomU limitation - how to increae this? (centos 5 x86_64)

Steven Haigh netwiz at crc.id.au
Mon Jun 4 22:26:18 UTC 2007

Quoting Johnny Tan <jtan at limewire.com>:
> Urs Rau wrote:
>> Thanks, I tried this, but no change. I think this was/is possibly just
>> related to the limit of number of loopback interfaces the standard
>> kernel has. And how to increase this. But for me it has no effect on the
>> number of DomU I can run. I only manage Dom0 + 4 after that it just
>> hangs on a xm create and when I hit Ctrl-c it comes back with the error
>> Error: Device creation failed for domain test5.
> Assuming you are using the xen packages that came with CentOS-5 (as
> opposed to downloading XenExpress which I believe has a hard limit of 4
> vms), I'm at a loss here too.
> Also, it seems you are doing full virtualization (I'm doing para), but
> I don't see why that would make a difference. Although it might be
> interesting to see if you could create a paravirt VM.
> Either way, hopefully someone more knowledgeable can jump in here.

Are you able to post your Xen config files somewhere as well as an  
output of /proc/cpuinfo and /proc/meminfo?

Steven Haigh

Email: netwiz at crc.id.au
Web: http://www.crc.id.au
Phone: (03) 9017 0597 - 0404 087 474

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