Agent is Unreachable (REASON = Connection refused) but the host is UP
Folks,
Can I pick your brains, I keep recieving the smtp alert from Grid control which says;
Agent is Unreachable (REASON = Connection refused) but the host is UP
upto 5 minutes later the smtp mail is received
Agent is Unreachable clear : <SERVER> - Agent Unreachable is cleared
I have tried the usual
$> cd $ORACLE_HOME/bin
$> emctl start agent
$> emctl status agent
$> emctl upload agent
This is successful however shortly the messages re-appear. This is on a pre-production grid control which manages 35+ databases on 25+ Hosts and the smtp errors are filling the mailbox with these messages. FYI - The Hosts causing my headache are from a 2 node RAC hosting several instances including ASM running agent version 10.2.0.4.0
The network team says they are not seeing any connection drops in their logs.
Any assistance would be appreciated
Thanks DBA05 for pointing me to look at the trc and nohup files in there I found a number of errors which I could enter into metalink and subsequently identified the Patch 7031906 which seems to have fix a number of the issues and errors identified.
Primarily
Using a 10.2.0.4 Grid Agent to monitor a 10.2.0.4 Database.
The 10.2.0.4 Agent version is certified to monitor a 10.2.0.4 Database.
The <AGENT_HOME>/sysman/log/emagent.trc shows that the health_check metric is repeatedly failing for this database :
2008-06-09 15:21:11,173 Thread-3658 ERROR fetchlets.healthCheck: GIM-00105: file not found
2008-06-09 15:21:11,174 Thread-3658 ERROR engine: [oracle_database,dbname,health_check] : nmeegd_GetMetricData failed : Instance Health Check initialization failed due to one of the following causes: the owner of the EM agent process is not same as the owner of the Oracle instance processes; the owner of the EM agent process is not part of the dba group; or the database version is not 10g (10.1.0.2) and above.
Repeated failure while executing this metric can cause the Agent to re-start, as it runs out of file handlers at the OS level.
- The database is a 64 bit installation but emagent executable is of 32 bit installation though the
64 bit agent software is installed.
I also found these worth a check
- Re-starting the database to create this hc_<SID>.dat file does not help in resolving the Healthcheck Metrics error.
- The <DATABASE_OH>/dbs/hc_<SID>.dat file has sufficient permissions to be read by the agent
Mark
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How occurs the problem:
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