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  • Tom Teigen thinks this is interesting:

$GIRD_HOME/log/<hostname>/cssd

From

Cover of Expert Oracle RAC 12c

Note

this isn't really true. All of the log files have been moved to /u01/app/grid/diag/crs/fwoda0/crs/trace (in our case on node 0 of the ODA) more generally the ADR_HOME/crs/<hostname>/crs/trace
a good link explaining the new location of the logs
https://www.toadworld.com/platforms/oracle/b/weblog/archive/2016/02/03/oracle-12c-rac-clusterware-logs-are-now-centralized