The virtual machine swap file can only be stored on shared storage. This is required for the advanced features of vSphere.

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Quizplus · Accepted Answer

A virtual machine swap file can be located on either local ESX storage or on shared storage. Either way, the virtual machine can take advantage of vSphere advanced features such as HA and DRS. If the virtual machine has its swap file located on the ESX host, then the swap file will have to be copied to the new ESX host as part of a vMotion migration activity.

The Virtual Machine Swap File Can Only Be Stored on Shared