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Showing posts from November 12, 2017

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. ...