How does SAN cloning work? What are the storage and LUN access requirements?
If you want to employ rapid provisioning of SAN based templates, then the target ESX Server must have access to the VMFS volume on which the template is stored. If you create a LUN mask that prevents an ESX Server from seeing the templates, then you will not be able to use SAN-based provisioning. The best practice recommendation is to have all templates stored on a single VMFS volume that is accessible by all the ESX Servers. The ESX Servers can store their virtual machine disks on a separate volume from the templates.