CRS啟動的三個主要的後臺程式

tolywang發表於2008-04-01

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 failure


OCSSD: - 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

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