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  Virtual machine storage overhead
  Storage overhead per virtual machine depends on specific requests for resource allocation within the virtual machine. The request could be for ephemeral storage on the node or storage resources hosted elsewhere in the cluster. OpenShift Virtualization does not currently allocate any additional ephemeral storage for the running container itself.
  Example
  As a cluster administrator, if you plan to host 10 virtual machines in the cluster, each with 1 GiB of RAM and 2 vCPUs, the memory impact across the cluster is 11.68 GiB. The estimated on-disk storage impact for each node in the cluster is 10 GiB and the CPU impact for worker nodes that host virtual machine workloads is a minimum of 2 cores.

How does the example reach the said conclusion for the RAM and CPU. Each VM is allocated 1GB x 10 VM. the document indicate the worker nodes has a VM RAM pressure of 0.396GB x 10VM and a 0.36GB Node Pressure which comes to a 14.32GB inclusive of the RAM Allocation.

• Current Page URL: https://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html/virtualization/installing#virt-cluster-resource-requirements_preparing-cluster-for-virt
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• Date (End date): 2026-01-21 21:01:23
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