The plugin is able to work with Grid-Infrastructure and Oracle Restart for
Version 12.2+. There is no guarantee that the oratab has valid entries anymore.
In most configurations the data for ASM and instances are missing from 18c
onwards. The plugin reads the ORACLE_HOME from the cluster registry. This also
makes the plugin compatible for Clusters with policy managed databases, which
was not supported in previous versions. Mostly known in environments with '_1'
at the end of the ORACLE_SID in oratab.
Please be aware that this feauture must be disabled in installations with
Oracle Grid Infrastructure and custom scripts for Failover Clusters. These type
of installation is rare and need a valid configuration in oratab and as a
result the automatic gathering of ORACLE_HOME from the cluster repository must
be disabled. Please set the variable OLRLOC in mk_oracle.cfg to a non existing
file or /dev/null to disable this feauture. Real Application Clusters or Oracle
Restart with version 11.2+ are not affected. Please disable it for CRS
10.1-11.1 as well. This change can be ignorred in normal single Instance
installations without Grid Infrastructure or Oracle Restart - mostly known as
installations without ASM.
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