在某些情况下，在unix/linux上的Oracle crs无法启动，需要oracle以single instance启动的时候，可以重新编译（Relinking）oracle，关闭RAC特性，下面记录其方法：
RAC ON
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Login as the Oracle software owner and shutdown all database instances on all nodes in the cluster.
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cd $ORACLE_HOME/rdbms/lib
- make -f ins_rdbms.mk rac_on
If this step did not fail with fatal errors then proceed to step 4.
- make -f ins_rdbms.mk ioracle
RAC OFF 解除grid和数据库的关系，srvctl将无法操作数据库
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Login as the Oracle software owner and shutdown all database instances on all nodes in the cluster.
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cd $ORACLE_HOME/rdbms/lib
- make -f ins_rdbms.mk rac_off
If this step did not fail with fatal errors, proceed to step 4.
- make -f ins_rdbms.mk ioracle