Storage Foundation for Oracle® RAC 7.4.1 Administrator's Guide - Linux
- Section I. SF Oracle RAC concepts and administration
- Overview of Storage Foundation for Oracle RAC
- About Storage Foundation for Oracle RAC
- Component products and processes of SF Oracle RAC
- About Virtual Business Services
- Administering SF Oracle RAC and its components
- Administering SF Oracle RAC
- Starting or stopping SF Oracle RAC on each node
- Administering VCS
- Administering I/O fencing
- About the vxfentsthdw utility
- Testing the coordinator disk group using the -c option of vxfentsthdw
- About the vxfenadm utility
- About the vxfenclearpre utility
- About the vxfenswap utility
- Administering the CP server
- Administering CFS
- Administering CVM
- Changing the CVM master manually
- Administering Flexible Storage Sharing
- Backing up and restoring disk group configuration data
- Administering SF Oracle RAC global clusters
- Administering SF Oracle RAC
- Overview of Storage Foundation for Oracle RAC
- Section II. Performance and troubleshooting
- Troubleshooting SF Oracle RAC
- About troubleshooting SF Oracle RAC
- Troubleshooting I/O fencing
- Fencing startup reports preexisting split-brain
- Troubleshooting CP server
- Troubleshooting server-based fencing on the SF Oracle RAC cluster nodes
- Issues during online migration of coordination points
- Troubleshooting Cluster Volume Manager in SF Oracle RAC clusters
- Troubleshooting CFS
- Troubleshooting interconnects
- Troubleshooting Oracle
- Troubleshooting ODM in SF Oracle RAC clusters
- Prevention and recovery strategies
- Tunable parameters
- Troubleshooting SF Oracle RAC
- Section III. Reference
Oracle Cluster Registry
The Oracle Cluster Registry (OCR) contains cluster and database configuration and state information for Oracle RAC and Oracle Clusterware/Grid Infrastructure.
The information maintained in the OCR includes:
The list of nodes
The mapping of database instances to nodes
Oracle Clusterware application resource profiles
Resource profiles that define the properties of resources under Oracle Clusterware/Grid Infrastructure control
Rules that define dependencies between the Oracle Clusterware/Grid Infrastructure resources
The current state of the cluster
For Oracle 11gR2 and 12cR1, the OCR data exists on ASM or a cluster file system that is accessible to each node. However, for Oracle 12cR2 or later the OCR and voting files are stored on Oracle ASM disk groups, because those Oracle versions do not support storage of cluster files directly on CFS.
Use CVM mirrored volumes to protect OCR data from failures.Oracle Clusterware/Grid Infrastructure faults nodes if OCR is not accessible because of corruption or disk failure. Oracle automatically backs up OCR data. You can also export the OCR contents before making configuration changes in Oracle Clusterware/Grid Infrastructure. This way, if you encounter configuration problems and are unable to restart Oracle Clusterware/Grid Infrastructure, you can restore the original contents.
Consult the Oracle documentation for instructions on exporting and restoring OCR contents.