VMware KB: ESXi/ESX hosts with visibility to RDM LUNs being used by MSCS nodes with RDMs may take a long time to boot or during LUN rescan
29 July, 2013
This was a great find – fixed the 45 minute boot time due to the large number of RDMs in use:
7 November, 2012
Investigating virtual machine file locks on ESX/ESXi
Interesting guide on how to troubleshoot VM Power on issues relating to locked files.