1. A method comprising: determining whether a source virtual machine executing on a source computing system is migrated to a destination computing system for execution as a migrated virtual machine by detecting a change of a first identifier identifying the source virtual machine and of a second identifier identifying the source computing system; and in response to determining that the source virtual machine is migrated to the destination computing system, initializing a storage device at the destination computing system to operate as a caching device for the migrated virtual machine and caching data stored by the migrated virtual machine at the storage device.