By default, virtual machines perform checks to ensure that the amount of memory allocated to running virtual machines plus an overhead does not exceed the limits imposed by the user or by VMware GSX Server defaults. See Memory Use: Host Operating System and Virtual Machines for a description of how VMware GSX Server chooses the default amount of memory for virtual machines.
If you need to allocate more memory to your virtual machines, you can disable the memory checks (also called memory limits) and change the memory limits. When you disable the memory checks, you:
Warning: Disabling the memory limits check can result in poor performance for both the host operating system and guest operating systems. Disabling memory checks can also result in system crashes, low memory warnings, or processes in the host abnormally terminating.
To disable memory checks:
Connect to a virtual machine with a console.
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