Oracle Clusterware Diagnosis - Expert Oracle RAC Performance Diagnostics and Tuning - page 535

Network Switch

Public Network

Interconnect Switch Cluster Interconnect In

ORADB3
SSKY3

ORADB4
SSKY4

VIP VIP

ORADB1 ORADB2

VIP VIP

SSKY1 SSKY2

GIPCD

CRFMOND/LOGD

DISKMON DISKMON DISKMON

GPnP GPnP GPnP

NM

CTSS CTSS CTSS

CSS

GM

CSS CSS CSS

EVM

EVM EVM EVM

OCR

CRS

CRS CRS CRS

HAS

HAS HAS HAS

SAN switch

OLR OLR

OLR OLR

prddb

OCR

Vo te Di sk

AA_00 AB_01 AC_02 AD_03 AE_04 AF_05 AG_06 AH_07

Figure 16-1. Grid Infrastructure stack

■ in the following sections only the primary components are discussed. Discussions of all the components are
beyond the scope of this topic.

Note

The Oracle Cluster Registry (OCR)
OCR is a cluster repository used to maintain application resources and their availability within the RAC environment.
The repository is a file created on the shared-storage subsystem (illustrated in Figure 16-1 ) during Oracle GI installation.
OCR contains the high availability (HA) rules for the various resources managed by the clusterware.
These rules are maintained and updated by one of several client applications: server control utility ( srvctl) ,
cluster-ready services utility ( crsctl ), 1 Oracle Enterprise Manager (OEM), ASM Configuration Assistant ( asmca ),
Database Configuration Assistant ( dbca ), and the network configuration assistant ( netca ).

1 Cluster-ready services utility provides several command-line functions such as register, unregister, start, stop, etc.