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
Periodic health evaluation of SF Oracle RAC clusters
SF Oracle RAC provides a health check utility that evaluates the components and configuration in an SF Oracle RAC cluster. The utility when invoked gathers real-time operational information on cluster components and displays the report on your system console. You must run the utility on each node in the cluster.
The utility evaluates the health of the following components:
Low Latency Transport (LLT)
LLT Multiplexer (LMX)
VCSMM
I/O fencing
Oracle Clusterware/Grid Infrastructure
PrivNIC and MultiPrivNIC
The health check utility is installed at /opt/VRTSvcs/rac/healthcheck/healthcheck
during the installation of SF Oracle RAC.
The utility determines the health of the components by gathering information from configuration files or by reading the threshold values set in the health check configuration file /opt/VRTSvcs/rac/healthcheck/healthcheck.cf
The utility displays a warning message when the operational state of the component violates the configured settings for the component or when the health score approaches or exceeds the threshold value. You can modify the health check configuration file to set the threshold values to the desired level.
The health checks for the I/O fencing, PrivNIC, MultiPrivNIC, and Oracle Clusterware components do not use threshold settings.
Note:
You must set the ORACLE_HOME and CRS_HOME parameters in the configuration file as appropriate for your setup.
Table: Setting threshold values provides guidelines on changing the threshold values.
Table: Setting threshold values
Requirement | Setting the threshold |
---|---|
To detect warnings early | Reduce the corresponding threshold value. |
To suppress warnings | Increase the corresponding threshold value. Warning: Using very high threshold values can prevent the health check utility from forecasting potential problems in the cluster. Exercise caution with high values. |
Note:
You can schedule periodic health evaluation of your clusters, by scheduling the utility to run as a cron job.
See Scheduling periodic health checks for your SF Oracle RAC cluster.
For detailed information on the list of health checks performed for each component, see the appendix List of SF Oracle RAC health checks.