Orarootagent：一个特别的oraagent，用来帮助crsd管理root用户的资源：网络，gridvip。
Css，evm，ons会和其他节点上的集群组件进行通信。这些组件也是oracle数据库，应用，oracle高可用性组件间的主要通信链路。除此之外，这些后台进程也监控，管理数据库的操作。
The Oracle High Availability Services Stack
This section describes the processes thatcomprise the Oracle High Availability Services stack. The list includescomponents that are processes on Linux and UNIX operating systems, or services onWindows.
■ Cluster Logger Service (ologgerd): Receives information from allthe nodes in the cluster and persists in a CHM repository-based database. Thisservice runs on only two nodes in a cluster.
Ologgerd：从集群的所有节点接受信息并将信息存放到CHM信息库中。该服务运行在集群中的所有节点。
■ System Monitor Service (osysmond): The monitoring and operatingsystem metric collection service that sends the data to the cluster loggerservice. This service runs on every node in a cluster.
Osysmond：监控和os度量收集，并将数据发送到集群日志服务。这个服务运行在集群中的每个节点。
■ Grid Plug and Play (GPNPD): Provides access to the Grid Plug andPlay profile, and coordinates updates to the profile among the nodes of thecluster to ensure that all of the nodes have the most recent profile.
Gpnpd：通过访问gpnp配置文件，以及协调更新集群中所有节点的配置文件，确保所有节点拥有最近的配置文件。
■ Grid Interprocess Communication (GIPC): A support daemon thatenables Redundant Interconnect Usage.
Gipc：确保内联冗余的使用的守护进程。
■ Multicast Domain Name Service (mDNS): Used by Grid Plug and Play tolocate profiles in the cluster, as well as by GNS to perform name resolution.The mDNS process is a background process on Linux and UNIX and on Windows.
Mdns：被gpnp用来定位集群中的配置文件；gns用他来作命名解析。
■ Oracle Grid Naming Service (GNS): Handles requests sent by externalDNS servers, performing name resolution for names defined by the cluster.
Gns：处理外部dns服务器的请求，为集群定义的名字进行命名解析
Table 1–1 lists the processes and servicesassociated with Oracle Clusterware components. In Table 1–1, if a UNIX or aLinux system process has an (r) beside it, then the process runs as the rootuser.
