Oracle root agent (orarootagent): Is a specialized oraagent process that helps CRSD manage resources owned by root, such as the network, and the Grid virtual IP address. This process was known as RACG in Oracle Clusterware 11g Release 1 (11.1). It runs server callout scripts when FAN events occur. oraagent: Extends clusterware to support Oracle-specific requirements and complex resources. 
Oracle Notification Service (ONS): Is a publish-and-subscribe service for communicating Fast Application Notification (FAN) events. The GNS process performs name resolution within the cluster. Oracle Grid Naming Service (GNS): Is a gateway between the cluster mDNS and external DNS servers. The mDNS process is a background process on Linux and UNIX, and a service on Windows. Multicast domain name service (mDNS): Allows DNS requests. Event Manager (EVM): Is a background process that publishes Oracle Clusterware events. As Exadata storage can be added to any Oracle RAC node at any point in time, the diskmon daemon is always started when ocssd is started. Disk Monitor daemon (diskmon): Monitors and performs input/output fencing for Oracle Exadata Storage Server. A cssdagent failure results in Oracle Clusterware restarting the node. This service formerly was provided by Oracle Process Monitor daemon (oprocd), also known as OraFenceService on Windows. The cssdagent process monitors the cluster and provides input/output fencing. 
CSS has three separate processes: the CSS daemon (ocssd), the CSS Agent (cssdagent), and the CSS Monitor (cssdmonitor). If you are using certified third-party clusterware, then CSS processes interfaces with your clusterware to manage node membership information.
Cluster Synchronization Service (CSS): Manages the cluster configuration by controlling which nodes are members of the cluster and by notifying members when a node joins or leaves the cluster. The crsd process generates events when the status of a resource changes. This includes start, stop, monitor, and failover operations. The CRS daemon (crsd) manages cluster resources based on configuration information that is stored in Oracle Cluster Registry (OCR) for each resource. What are the background process that exists in 11gr2 and functionality? Process Name
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