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Win2K3 Cluster - DB and CI


We want to cluster SAP ECC 6.0 for the Database Instance and Central Instance servers on Windows Server 2003 running SQL 2005.

On following the SAPinst guide, it is mentioned that only only ABAP Central Services Instance and Database Instance should be configured as failover in MSCS cluster. Central Instance and Dialog Instance should be installed on any single node on the local disk or outside the MSCS node.

I have doubt about this. If i install CI on any one cluster node locally, what would happen if this server fails ? I want to install the Central Instance as failover too.

Please guide.

Thanks in advance.


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  • Best Answer
    Mar 06, 2009 at 09:10 PM


    The installation guide is correct. The "central instance" is a bit of a misnomer these days. It is nothing more than the first installed dialog server at this point. The central services will be installed in the cluster and the second "dialog instance" can run just fine when the "central instance" is down. The only thing that is on the central instance that is not on additional dialog instances are the J2EE tools like Visual Admin and Config Tool (in /usr/sap/<SID>/<INSTANCE>/j2ee. This is not a big deal.

    You will want to change your instance profiles and make sure that all application servers have dialog, batch, spool, update, and update2 processes so that they can function on their own. You may also want to add a gateway to the ABAP central services instance so that you have an HA gateway.


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    • Former Member Former Member


      Actually I installed in DB2 database urs is SQL.

      How is the insttalation? is it finshed successfully? I ame xpecting it is working fine.

      How the faile over? can u give me reply.