Reg: Compute node resources sharing Clarification

asked 2013-05-30 14:06:46 -0600

updated 2013-05-30 17:29:23 -0600

fifieldt gravatar image

I would like to know how the sharing of resources happening in OpenStack. Assume that there are two compute nodes of 4 physical cores each with 16 GB of Physical RAM each, would I be able to start an instance with 8 cores and 32 Gb of RAM. How this is handled in Openstack.

Please guide me.


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answered 2013-05-30 22:09:15 -0600

Sagar Ratnakara Nikam gravatar image

Each nova-compute sends the available stats(CPU,Memory, Disk) to the controller. This stat is updated every minute by all nova-computes When a VM is booted, flavor is one of the parameters the scheduler considers to find a suitable compute host. In your case, if you have defined a flavor 8 CPUs and 32 GB memory, the scheduler will not find any suitable host and nova boot will fail with "NoValidHost" error

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Asked: 2013-05-30 14:06:46 -0600

Seen: 65 times

Last updated: May 30 '13