Crsd :
The CRS daemon (crsd) manages
cluster resources based on configuration information that is stored in Oracle
Cluster Registry (OCR) for each resource. This includes start, stop, monitor,
and failover operations. The crsd process generates events when the status of a
resource changes.
Cssd :
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. If you are using certified third-party clusterware, then CSS processes
interfaces with your clusterware to manage node membership information. CSS has
three separate processes: the CSS daemon (ocssd), the CSS Agent (cssdagent),
and the CSS Monitor (cssdmonitor). The cssdagent process monitors the cluster
and provides input/output fencing. This service formerly was provided by Oracle
Process Monitor daemon (oprocd), also known as OraFenceService on Windows. A
cssdagent failure results in Oracle Clusterware restarting the node.
Diskmon :
Disk Monitor daemon (diskmon):
Monitors and performs input/output fencing for Oracle Exadata Storage Server.
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.
Evmd :
Event Manager (EVM): Is a
background process that publishes Oracle Clusterware events
Mdnsd :
Multicast domain name service
(mDNS): Allows DNS requests. The mDNS process is a background process on Linux
and UNIX, and a service on Windows.
Gnsd :
Oracle Grid Naming Service (GNS):
Is a gateway between the cluster mDNS and external DNS servers. The GNS process
performs name resolution within the cluster.
Ons :
Oracle Notification Service
(ONS): Is a publish-and-subscribe service for communicating Fast Application
Notification (FAN) events
Oraagent :
oraagent: Extends clusterware to
support Oracle-specific requirements and complex resources. It runs server
callout scripts when FAN events occur. This process was known as RACG in Oracle
Clusterware 11g Release 1 (11.1).
Orarootagent :
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
Oclskd :
Cluster kill daemon (oclskd):
Handles instance/node evictions requests that have been escalated to CSS .
Gipcd :
Grid IPC daemon (gipcd): Is a
helper daemon for the communications infrastructure
Ctssd :
Cluster time synchronisation
daemon(ctssd) to manage the time syncrhonization between nodes, rather
depending on NTP.
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