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Is there any way to increase resources of the hypervisor on OpenStack, e.g: VCPU, memory or Number of the volumes?

I can use the following command to see them:

openstack hypervisor stats show

But I can't find the configuration file. I am not sure if it is possible to change them.

Thanks in advance

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3 Answers 3

Reset to default
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The available resources are limited by the compute (and storage) hardware, but you can overcommit CPU, RAM and disk, see the docs for more information. For example, the default CPU overallocation ratio is 1:16, so one physical CPU results in 16 virtual CPUs. The respective config value is cpu_allocation_ratio in nova.conf. But be aware that overcommitting can lead to performance degredation and is highly depending on your workload. As for the volumes, you can always resize (increase) volumes if the free space in your storage back end allows it.

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To increase the resources of the hypervisor you need to add additional hardware.

  • CPU: replace the CPU with one that has more cores
  • RAM: add/replace memory modules
  • storage: add/replace hard disks
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The only way to increase resource is to either upgrade the compute-node itself by putting more hardware resources in server (Ram , second Cpu , etc) or

add additional compute-node to nova.

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