CRS management and maintenance

CRS is the abbreviation of Oracle Cluster Ready Service (Oracle Cluster Ready Service). Starting from Oracle 10gR2, Oracle changed its name to Clusterware. Generally, we think that CRS = Clusterware = Oracle Cluster Ready Service = Oracle Cluster Software. CRS clusterTo manage and use grid users, common commands are stored in the installation directory $ORACLE_HOME/bin of the grid software.
First, start and stop CRS
Oracle CRS is automatically started when the system starts, usually do not need to start and stop manually.However, in special circumstances such as system upgrade, maintenance or
debugging, it is also necessary to manually stop or start the CRS service.

1. Stop CRS on a single node
Switch to the /u01/app/grid/product/11.2.0/bin directory under the root user
# ./crsctl stop crs

2. Single node start CRS
# ./crsctl start crs

3. Stop all cluster resources running on all nodes
# ./crsctl stop cluster -all

4. Start all cluster resources running on all nodes
# ./crsctl start cluster -all

Second, verify CRS
1. Check the current state of a cluster
# ./crsctlcheck cluster

2. Check the current status of the CRS
# ./crsctl check crs

3. Check the current status of OHASD
# ./crsctl check has

Three, disable and enable the CRS daemon
# ./crsctl disable crs
# ./crsctl enable crs

Fourth, display the status of cluster resources
# ./crsctl start res -t

5. Query the software version of CRS
# ./crsctl query crs softwareversion

Note: For other usages of crsctl, please refer to the online documentation: Usage:crsctl