======================================================= MCSG: Reasons for TOC ======================================================= :Title: MCSG: Reasons for TOC :Author: Douglas O'Leary :Description: MCSG: Reasons for TOC :Date created: 06/2007 :Date updated: 07/2008 :Disclaimer: Standard: Use the information that follows at your own risk. If you screw up a system, don't blame it on me... Transfer of Control (TOC) is a flashy name for a hard system reboot. It's not a system crash, so there won't be a dump to analyze; however, it's not a shutdown -r either, so filesystems will have to be checked and any RDBMSs will have to go through their recovery methods. MCSG will TOC a system in order to release system resources and to ensure data integrity. There are several scenarios in which MCSG will TOC a system. They are: #. A two-node cluster loses heartbeat at which time a single node cluster will form. The system that loses the race to the lock disk will TOC. #. The cluster daemon, cmcld, dies for any reason #. NODE_FAIL_FAST=YES is set in a package configuration file. #. The cluster lvm daemon, cmlvmd, dies for any reason. #. System safety time is disabled via the cmsetsafety command. #. SERVICE_FAIL_FAST_ENABLED = YES is set (causes reboot).