Virtual Machine Recommendations and Limits

Virtual machines (VMs) require certain CPU core resources and have and other limits for memory, networks, and storage.

Recommended Number of CPU Cores

The number of cores recommended for everRun workloads depends upon the number of vCPUs in each VM and the types of the VMs as described below:

The actual number of required threads depends upon the workload. The guidelines above should cover most workloads. Since any given workload may require fewer or more threads, it’s good practice to test and characterize your specific workload.

Examples

A single 4-vCPU FT guest typically requires:

• 2 threads for host/system management

• 6 threads for guest

  • 8 threads total (a single socket 4-core hyper-threaded system)

Four 5-vCPU FT guests typically require:

• 2 threads for host/system management

• 7 threads for first guest

• 7 threads for second guest

• 7 threads for third guest

• 7 threads for fourth guest

  • 30 threads total (a dual socket 8-core hyper-threaded system)

Virtual Machine Limits

For systems with many or large virtual machines (VMs), configure everRun with 10 Gb sync links, and for the everRun software itself, 4 vCPUs and 4096 MB. Refer to the Preferences -> Systems Resources page in the everRun Availability Console for instructions on setting the everRun system resources to the maximum.

The following table lists everRun system VM limits.