According to Enterprise Storage Forum, a VMware spokesman said the certification program "is designed to test and ensure interoperability between the storage virtualization device and VMware ESX Server. Once a device passes this test suite, VMware places it on the VMware SAN Compatibility Guide (which is published on the VMware Web site) and provides customer support for the configuration."
EMC, Hitachi Data Systems, HP, IBM and Network Appliance are already on board to get certified later this year.
VMware is, of course, hardly the only vendor making a virtual crossing. Virtualization and storage are highly complementary, perhaps because many of the components of a traditional storage platform, such as RAID, have an architecture similar to that of a virtual environment.
From that angle, EMC's talons seem a natural fit for VMware. This compatibility perhaps also accounts for the fact that the virtual storage pool is getting increasingly crowded, especially as many of the traditionally physical components of a storage system get virtualized.