To support clusterware on unix system several processes must run on each node in the cluster.
The Oracle Clusterware processes on UNIX-based systems are:
1)crsd: This is Cluster Ready Services Daemon. This process runs as root user. It performs high availability recovery and management operations such as maintaining the OCR and managing application resources. This process restarts automatically upon failure.
2)evmd: This is EVent Manager Daemon. This process runs as root user. It starts the racgevt process to manage FAN server callouts.
3)ocssd: This is Oracle Cluster Synchronization Services Daemon. This process runs as oracle user. It manages cluster node membership and failure of this process results in cluster restart.
4)oprocd: This is Oracle PROcess monitor Daemon. This process runs as root user. Note that this process only appears on platforms that do not use vendor clusterware with Oracle Clusterware.
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