Compute Offerings in CloudStack are configured with both CPU speed (MHz) and CPU core count. CloudStack will not allow you deploy a VM using an offering with 10 cores if your hosts only have 8 cores, regardless of the configured CPU speed. The VM deployment will fail.
Some hypervisors actually do allow such deployments, but the hypervisor vendors strongly discourage it. The documentation I've seen suggests there are performance problems with such a configuration. I've never seen a reason to use such a configuration and the best practices guides I've read recommend configuring VMs with the fewest cores possible. If anyone has a valid use case for this and really needs it, file an enhancement request to allow it in CloudStack. Best regards, Kirk On 09/18/2013 01:30 PM, Rafael Weingartner wrote: > I guess it would depend on the amount of CPU power you give, as and example > if you give 10 cores with 1Ghz, the CS probably would allocate the VM if > you have 8 real cores with 2Ghz each. > > > 2013/9/18 Daan Hoogland <[email protected]> > >> I'm guessing here; I think you can but you'll get an error deploying it. >> >> >> On Wed, Sep 18, 2013 at 9:03 PM, Steven Liang <[email protected]>wrote: >> >>> Thank you for replying. >>> I have another question. If there are only 8 core cpu on every hosts, can >>> I assign 10 cpu to a vm? >>> >>> >>> On 09/18/2013 01:31 PM, Daan Hoogland wrote: >>> >>> If you have 1G and a factor of 2, you van instantiate 2 machines with >>> 1G. This is useful of you don't expect all machines top be running art the >>> dame time. >>> >>> Regards, >>> mobile biligual spell checker used >>> Op 18 sep. 2013 17:54 schreef "Steven Liang" <[email protected]> het >>> volgende: >>> >>>> Hi, >>>> >>>> What is cpu.overprovisioning.factor use for? >>>> Who can explain it more detailed? >>>> Thank you. >>>> >>>> -- >>>> *Steven Liang* >>>> *Linux System Admin* >>>> *Phone*: 1.416.499.8009 ext. 2865 >>>> *Cell Phone*: 1.647.718.5292 >>>> *Email*: [email protected] >>>> www.yesup.com | account.yesup.com >>>> >>>> [image: Yesup] >>>> >>> >>> >>> -- >>> *Steven Liang* >>> *Linux System Admin* >>> *Phone*: 1.416.499.8009 ext. 2865 >>> *Cell Phone*: 1.647.718.5292 >>> *Email*: [email protected] >>> www.yesup.com | account.yesup.com >>> >>> [image: Yesup] >>> >> >> > >
