NetApp Reference Architect Peter Learmonth has recently published a post on how to boot multiple ESX servers from clones of a master boot LUN. This is great news for customers who prefer booting from a SAN to alternatives like ESXi auto deploy or PXE-based installs.
You can read about this process, the root cause which prohibited this from working out of the box, and the multiple methods of enabling ESX boot from LUN clones on storage arrays powered by Data ONTAP at Get Virtical.