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What are virtual machine memory limits?

Question:

What are virtual machine memory limits?

Answer:

Limits, minimum and maximum, on the amount of memory for any given virtual machine are determined from three sources:

  • Operating system
  • Data center
  • Cluster

The minimum virtual machine memory is the greatest of the minimums from the three sources. The maximum virtual machine memory is the least of the maximums from the three sources. For most compute pools, either reserved or instance-based, virtual machines may be configured with a minimum of 16 MB. For most compute pools, either reserved or instance-based, virtual machines may be configured with a maximum of 16,384 MB or 16 GB.

For example, if the operating system supports a maximum of 261,120 MB and the data center supports a maximum of 65,536 MB and the cluster supports a maximum of 16,384 MB, the virtual machine is constrained to 16,384 MB.

Note: Memory is always entered in megabytes (MB) and must be a multiple of 4.

The Enterprise Cloud also supports Large Memory Virtual Machine (LMVM) compute pools. In LMVM compute pools, virtual machines may have a minimum of 16,384 MB (16 GB) of memory and a maximum of 131,072 MB (128 GB) of memory. If your workload demands such memory capacity, contact your service delivery manager to purchase a LMVM compute pool.

Note: Large Memory Virtual Machine compute pools must be reserved; they may not be instance-based.