ESX 3.0.2 host hung after re-scan LUNs

Hi there,

We have 5 ESX 3.0.2 server hosts, one day I did re-scan entire HBAs because I want to add two new LUNs into the datastore, but

the server host hung. After rebooting, the ESX server host looks like fine again. How to find the root cause of hang?  I read the ESX

server log, cannot find any clues, are there any other log files or coredump files? how to get them? thanks.