[vbox-dev] Linux Host VM Cap?

Klaus Espenlaub klaus.espenlaub at oracle.com
Fri Apr 29 07:25:44 PDT 2011

On 25.04.2011 18:00, Zak Perschon wrote:
> I've come across what is seemingly a hard cap for the amount of
> concurrent VMs I can run on a Linux based machine (after posting on the
> support forums, I was directed here). Apparently this same cap was
> encountered on a solaris host and a fix was deployed to increase the
> amount of VMs that were allowed to run at the same time. Was this fix
> supposed to be included in other OS releases? Any information on this
> would be greatly appreciated.

That's a rather vague statement, and if you could tell what number of 
concurrently running VMs you can achieve I might be able to infer what 
limit is causing trouble for you.

It could be the SysV semaphore count, the number of open files per 
process, and so on. All these defaults depend on the kernel 
configuration and/or distribution, so it's hard to generalize.

Solaris is easy compared to that, as it is very uniform compared to Linux.


> Here is the information on the hardware/VM profiles I am using
> Host Machine:
> 128 Processor Cores (64 dual core Xenon processors running at 2.27 GHz)
> 2.0 TB Memory (1.8~ Usable)
> 1.8 TB RAID 0 (6 x 300GB HDD running at 10k RPM)
> 16TB SAS
> VM Profile
> Compiled TinyCore Linux 2.6
> Required Memory: 150~MB
> Required HDD Space: 50MB
> -Zak

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