Besides ADR data, Oracle Clusterware collects or uses other data related to problem diagnosis. Starting with Oracle Clusterware 12c release 1 (12.1.0.2), this data resides under the same base path used by ADR, but in a separate directory structure with this form: ORACLE_BASE/crsdata/host_name. In this example, ORACLE_BASE is the Oracle base path you specified when you installed the Grid Infrastructure and host_name is the name of the host.
In this directory, on a given host, are several subdirectories. The two subdirectories of greatest interest if a problem occurs are named core and output. The core directory is where Oracle Clusterware daemon core files are written when the normal ADR ___location used for core files is not available (for example, before ADR services are initialized in a program). The output directory is where Oracle Clusterware daemons redirect their C standard output and standard error files. These files generally use a name structure consisting of the executable name with the characters OUT appended to a .trc file extension (like trace files). For example, the redirected standard output from the Cluster Time Synchronization Service daemon is named octssdOUT.trc. Typically, daemons write very little to these files, but in certain failure scenarios important data may be written there.