In Oracle® Grid Infrastructure Installation Guide 11g Release 2 (11.2) for Linux , the section, About the Oracle Clusterware Alert Log , says that:
The Oracle Clusterware alert log is the first place to look for serious errors. In the event of an error, it can contain path information to diagnostic logs that can provide specific information about the cause of errors.
…
The location of the Oracle Clusterware log file is CRS_home /log/ hostname /alert hostname .log , where CRS_home is the directory in which Oracle Clusterware was installed and hostname is the host name of the local node.
In Oracle® Clusterware Administration and Deployment Guide 11g Release 2 (11.2) , the section, Clusterware Log Files and the Unified Log Directory Structure , says that:
Table H-1 Locations of Oracle Clusterware Component Log Files Component Log File Location Foot 1 Cluster Ready Services Daemon (CRSD) Log Files Grid_home /log/ host_name /crsd Cluster Synchronization Services (CSS) Grid_home /log/ host_name /cssd Cluster Time Synchronization Service (CTSS) Grid_home /log/ host_name /ctssd Grid Plug and Play Grid_home /log/ host_name /gpnpd Multicast Domain Name Service Daemon (MDNSD) Grid_home /log/ host_name /mdnsd Oracle Cluster Registry Oracle Cluster Registry tools (OCRDUMP, OCRCHECK, OCRCONFIG) record log information in the following location: Foot 2
Grid_home /log/ host_name /client
Cluster Ready Services records Oracle Cluster Registry log information in the following location:
Grid_home /log/ host_name /crsd
Oracle Grid Naming Service (GNS) Grid_home /log/ host_name /gnsd Oracle High Availability Services Daemon (OHASD) Grid_home /log/ host_name /ohasd Event Manager (EVM) information generated by evmd Grid_home /log/ host_name /evmd Oracle RAC RACG The Oracle RAC high availability trace files are located in the following two locations:
Grid_home /log/ host_name /racg
$ORACLE_HOME /log/ host_name /racg
Core files are in subdirectories of the log directory. Each RACG executable has a subdirectory assigned exclusively for that executable. The name of the RACG executable subdirectory is the same as the name of the executable.
Additionally, you can find logging information for the VIP and database in these two locations, respectively.
Server Manager (SRVM) Grid_home /log/ host_name /srvm Disk Monitor Daemon (diskmon) Grid_home /log/ host_name /diskmon Grid Interprocess Communication Daemon (GIPCD) Grid_home /log/ host_name /gipcd Footnote 1 The directory structure is the same for Linux, UNIX, and Windows systems.
Footnote 2 To change the amount of logging, edit the path in the Grid_home /srvm/admin/ocrlog.ini file.