oracle RAC Startup Sequence
Cluster ware start up sequence for oracle release 11gr2. This description is also from the MOS note stated above Short summary of the startup sequence: INIT spawns init.ohasd (with respawn) which in turn starts the OHASD process (Oracle High Availability Services Daemon). This daemon spawns 4 processes. Level 1: OHASD Spawns: cssdagent - Agent responsible for spawning CSSD. orarootagent - Agent responsible for managing all root owned ohasd resources. oraagent - Agent responsible for managing all oracle owned ohasd resources. cssdmonitor - Monitors CSSD and node health (along wth the cssdagent). Level 2: OHASD rootagent spawns: CSDD (ora.cssd) - Cluster Synchronization Services CRSD(ora.crsd) - Primary daemon responsible for managing cluster resources. CTSSD(ora.ctssd) - Cluster Time Synchronization Services Daemon Diskmon(ora.diskmon) ACFS (ASM Cluster File System) Drivers Level 2: OHASD