Oracle RAC Log Architecture!

Alarm Log
Cluster node cluster components alarm log: $GRID _home/log/Alarm log for DB instance: $DIAG _destination/rdbms/<dbname>/sid/trace/alert_<sid>.log

Installation log files
Debug log for root.sh configuration script: $GRID _home/cfgtoollogs/crsconfig/rootcrs_
Automated Diagnostics Warehouse
The Automatic diagnostics warehouse location is specified by the initialization parameter diagnostic_dest, as is the operating system environment variable $oracle_base.
If both Diagnostic_dest and $oracle_base are not set, the $oracle_home/log path is used.

[SQL]View Plaincopyprint?

2. Sql> SELECT * from v$diag_info;
6. inst_id NAME VALUE
8. ---------- ------------------------------ ------------------------------------------------------------
10. 2 Diag Enabled TRUE
12. 2 ADR Base/u01/app
14. 2 ADR Home/u01/app/diag/rdbms/orcl/orcl2
16. 2 Diag Trace/u01/app/diag/rdbms/orcl/orcl2/trace
18. 2 Diag Alert/u01/app/diag/rdbms/orcl/orcl2/alert
20. 2 Diag incident/u01/app/diag/rdbms/orcl/orcl2/incident
22. 2 Diag Cdump/u01/app/diag/rdbms/orcl/orcl2/cdump
24. 2 Health Monitor/u01/app/diag/rdbms/orcl/orcl2/hm
26. 2 Default Trace file/u01/app/diag/rdbms/orcl/orcl2/trace/orcl2_ora_15431.trc
28. 2 Active problem Count 0
30. 2 Active Incident Count 0
34. 11 rows have been selected.

Cdump: This directory contains core dumps
Trace: This directory dumps database alarm logs and trace files for foreground and background database processes.
Alert: This directory stores XML alarm logs.
HM: This directory stores health check output files.
Incident: This directory stores the incident directory generated by a critical error, and each incident directory is named after the incident ID.
Metadata: This directory contains diagnostic metadata.

Oracle Grid Infrastructure Log directory structure
$GRID _home/log This is the home directory for Oracle cluster components and ASM storage trace and diagnostic log files on each cluster node.
$GRID _home/log/$GRID _home/log/$GRID _home/log/$GRID _home/log/$GRID _HOME/LOG/&LT;HOSTNAME&GT;/CSSD contains the CSS log, which includes actions from the client CSS listener.
$GRID _HOME/LOG/&LT;HOSTNAME&GT;/CVU contains trace and diagnostic log files generated by the Oracle Cluster Validation utility.
$GRID _HOME/LOG/&LT;HOSTNAME&GT;/EVMD contains trace and diagnostic log files for the EVM daemon.
$GRID _HOME/LOG/&LT;HOSTNAME&GT;/GNSD contains trace and diagnostic log files for users to troubleshoot issues related to Oracle Grid command services.
$GRID _HOME/LOG/&LT;HOSTNAME&GT;/MDNSD contains trace and diagnostic log files that are used to troubleshoot the multicast Domain Name service.
The $GRID _HOME/LOG/&LT;HOSTNAME&GT;/RACG contains trace and debug logs for each Oracle RACG executable file.
$GRID _HOME/LOG/&LT;HOSTNAME&GT;/CRFLOGD contains trace and debug logs from the cluster record Server service records provided by the Oracle Cluster Health Monitor.
$GRID _HOME/LOG/&LT;HOSTNAME&GT;/CRSD contains trace and debug logs for the CRSD daemon.
$GRID _HOME/LOG/&LT;HOSTNAME&GT;/CTSSD contains trace and debug logs that the user excluded from the cluster time synchronization service failure.
$GRID _home/log/$GRID _HOME/LOG/&LT;HOSTNAME&GT;/GIPCD contains trace and debug logs that are used to exclude the Oracle grid interprocess communication daemon.
$GRID _HOME/LOG/&LT;HOSTNAME&GT;/GPNPD contains trace and debug logs for the grid Plug and Play daemon.
$GRID _HOME/LOG/&LT;HOSTNAME&GT;/OHASD contains trace and debug logs for the High availability daemon.

zhuanzai:http://blog.csdn.net/zq9017197/article/details/7759979

Oracle RAC Log Architecture!