3 types of system crashes

1.High Priority Machine Check (HPMC) - Normally the result of a piece of hardware causing a group 1 interrupt.

2.Transfer Of Control (TOC) - Initiated from console using the TC command form the command menu (GSP) or by Servicguard cmcld daemon in the event of a cluster reformation

3.PANIC - Occurs when the kernel detects a situation that makes no logical sense (like kernel data structures becoming corrupted)