Understanding 11g Grid Directory Structure , Config & Log files

If you can’t see directory structure properly, use this file

$cd /opt/app/oracle/Middleware
[oracle@Middleware]$ tree -L 2
.
|-- WebLogicServer
|   |-- Oracle_WT
|   |-- agent11g
|   |-- domain-registry.xml
|   |-- logs
|   |-- modules
|   |-- oms11g ($OMS_HOME)
|        |-- cfgtoollogs (Install Log)
|            |-- oui
|                |-- installActions2011XXX.log
|                |-- oraInstall2011XXX.log
|        |-- sysman
|            |-- log
|                |-- emrepocminst.log
|            |-- schemamanager
|                |-- emschema.log (Install Log)
|            |--config
|                |-- httpd_em.conf
|                |-- emoms.properties
|   |-- oracle_common
|   |-- patch_wls1032
|   |-- registry.dat
|   |-- registry.xml
|   |-- user_projects
|   |-- utils
|   |-- wlserver_10.3
|        |-- common
|            |-- emnodemanager (Oracle WebLogic Server Logs)
|                |-- nodemanager.log
|                |-- nodemanager.properties
|               
-- gc_inst (EM INSTANCE BASE)
 |-- WebTierIH1
 |   |-- OHS
 |   |-- auditlogs
 |   |-- bin
 |   |-- config
 |   |-- diagnostics
 |       |-- logs
 |           |-- OPMN
 |               |-- opmn  (WebTier logs)
 |                   |-- provision.log
 |                   |-- opmn.out
 |                   |-- debug.log
 |                   |-- opmn.log
 |           |-- OHS
 |               |-- ohs1  (WebTier logs)
 |                   |-- access_log
 |                   |-- mod_wl_ohs.log
 |-- em
 |   |-- EMGC_OMS1 (OMS_NAME)
 |       |-- emgc.properties ( Contains OMS ServerName, OMS PortNumbers)
 |       |-- Sysman
 |           |-- Log
 |               |--    emoms.log : Main log file for the OMS.
 |                 |        Number of files created will be = (log4j.appender.emlogAppender.MaxBackupIndex + 1)
 |                |--    emoms.trc :    Main trace file for the OMS.
 |                |        Number of files created will be = (log4j.appender.emtrcAppender.MaxBackupIndex + 1)
 |                |--    secure.log
 |                |        Contains output from the 'emctl secure oms' commands.
 |                |--    emctl.msg
 |                |        Created / written to by the HealthMonitor thread of the OMS, when it re-starts the OMS due to a critical error.
 |                |--    emctl.log
 |                        Created by the emctl utility, when any commands are executed in the OMS home          
 |-- user_projects
     |-- domains
         |-- GCDomain
             |-- servers
                 |-- EMGC_OMS1 (Oracle WebLogic Server Logs : GRID Logs)
                     |-- logs
                         |-- EMGC_OMS1.log        - JVM Application Log
                         |-- access.log           - Smiilar to http acess_log
                         |-- EMGC_OMS1.out   
                |-- EMGC_ADMINSERVER  (Oracle WebLogic Server Logs : AdminServer Logs)
                         |-- logs
                         |-- EMGC_ADMINSERVER.log       
                         |-- GCDomain.log                  
                         |-- EMGC_ADMINSERVER.out

---------------------------------------------------------------------------------------------------------
Component                                 Location
---------------------------------------------------------------------------------------------------------
Oracle HTTP Server (OHS)       <EM_INSTANCE_BASE>/<webtier_instance_name>/diagnostics/logs/OHS/<ohs_name>
For example,                /u01/app/Oracle/gc_inst/WebTierIH1/diagnostics/logs/OHS/ohs1

OPMN                        <EM_INSTANCE_BASE>/<webtier_instance_name>/diagnostics/logs/OPMN/<opmn_name>
For example,                /u01/app/Oracle/gc_inst/WebTierIH1/diagnostics/logs/OPMN/opmn1

Oracle WebLogic                <EM_INSTANCE_BASE>/user_projects/domains/<domain_name>/servers/<SERVER_NAME>/logs/<SERVER_NAME>.out
For example,                /u01/app/Oracle/gc_inst/user_projects/domains/GCDomain/servers/EMGC_OMS1/logs/EMGC_OMS1.out