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:
•CRSD - Primary daemon responsible for managing cluster resources.
•CTSSD - Cluster Time Synchronization Services Daemon
•Diskmon
•ACFS (ASM Cluster File System) Drivers

Level 2: OHASD oraagent spawns:
•MDNSD - Used for DNS lookup
•GIPCD - Used for inter-process and inter-node communication
•GPNPD - Grid Plug & Play Profile Daemon
•EVMD - Event Monitor Daemon
•ASM - Resource for monitoring ASM instances

Level 3: CRSD spawns:
•orarootagent - Agent responsible for managing all root owned crsd resources.
•oraagent - Agent responsible for managing all oracle owned crsd resources.

Level 4: CRSD rootagent spawns:
•Network resource - To monitor the public network
•SCAN VIP(s) - Single Client Access Name Virtual IPs
•Node VIPs - One per node
•ACFS Registery - For mounting ASM Cluster File System
•GNS VIP (optional) - VIP for GNS

Level 4: CRSD oraagent spawns:
•ASM Resouce - ASM Instance(s) resource
•Diskgroup - Used for managing/monitoring ASM diskgroups.
•DB Resource - Used for monitoring and managing the DB and instances
•SCAN Listener - Listener for single client access name, listening on SCAN VIP
•Listener - Node listener listening on the Node VIP
•Services - Used for monitoring and managing services
•ONS - Oracle Notification Service
•eONS - Enhanced Oracle Notification Service
•GSD - For 9i backward compatibility
•GNS (optional) - Grid Naming Service - Performs name resolution

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Mallikarjun Ramadurg
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