Can you boot ESX from a shared SAN?

A.
Yes

B.
No

Explanation:

If you want an ESX Server host to boot from a SAN, allocate an entire LUN to each ESX Server host. See the SAN Configuration Guide for more information on configuring an ESX Server host to boot from a SAN. ESX Server software does not support booting from a shared LUN. If you install ESX Server software onto a shared LUN, you might overwrite the data on the shared LUN.