CRSD,OCSSD,EVMD
[@more@]CRSD: - Engine for HA operation - Manages 'application resources'- Starts, stops, and fails 'application resources' over- Spawns separate 'actions' to start/stop/check application resources- Maintains configuration profiles in the OCR (Oracle Configuration Repository)- Stores current known state in the OCR.- Runs as root- Is restarted automatically on failureOCSSD: - OCSSD is part of RAC and Single Instance with ASM- Provides access to node membership- Provides group services- Provides basic cluster locking- Integrates with existing vendor clusteware, when present- Can also runs without integration to vendor clustware- Runs as Oracle.- Failure exit causes machine reboot. --- This is a feature to prevent data corruption in event of a split brain.
EVMD: - Generates events when things happen- Spawns a permanent child evmlogger- Evmlogger, on demand, spawns children- Scans callout directory and invokes callouts.- Runs as Oracle.- Restarted automatically on failure