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UNMAP setting turned off in ESX 5.x

On hosts running ESX 5.0, Virtual Storage Console for VMware vSphere automatically turns off the UNMAP ( VMFS3.EnableBlockDelete) parameter by setting it to 0.

On ESX 5.1 hosts, 0 is the default value. If you change this value to 1 on either ESX 5.0 or 5.1,VSC automatically resets it to 0. For this value to take effect, you must apply the HBA/CNA Adapter Settings on the host.

To avoid any potential performance impact due to UNMAP operations, VMware disabled this feature beginning in ESXi 5.0 Update 2. VSC ensures that this feature is disabled with all versions of ESXi 5.x.