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Q:
I have a problem in production environment with WebLogic 9.2 mp3.We are using Multi datasource with Oracle 9i RAC two nodes. Database team have maintaince so they took out one node out of RAC. when one of the WebLogic instance associated with connection pool to that RAC node shown the following Warning message and could not start the instance.The multi datasource is configured with algorithm-type as “Load-Balancing”
<Jun 3, 2010 3:12:23 AM EDT> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to STARTING>
<Jun 3, 2010 3:14:10 AM EDT> <Warning> <JDBC> <BEA-001129> <Received exception while creating connection for pool “DS2”: Io exception: The Network Adapter could not establish the connection>
What are the recommandations to avoid this kind of problems when one of the RAC nodes down and the WebLogic server should have High Availability and scalable?
Any configuration parameters need to set for this??
A:
The way 9.2 mp3 works with RAC is that the multidatasource represents a pool of datasources so if one datasource is not available it will mark that down and use the other datasources configured in the multidatasource. WLS controls the failover, not RAC and this version does not use FAN or FCF.
I assume you have test on reserve set in the connection of all the data sources as that is required to use multdatasource. This parameter is at datasource->connection pool-> advanced
“could not start the instance” means that WLS did not come up??
If you are bringing up a WLS instance without the DB up you may want to set initial connections to 0
© Scott S. Nelson
