5 Replies Latest reply on Oct 16, 2013 10:09 AM by rukbat

    Red Hat Cluster Suite and Oracle RAC

      HI Guys,

      Our boss will plan to configure Red Hat Cluster Suite to replace to update oracle RAC.

      Are there some experienced expert to explain advantage and risk of Red Hat Cluster Suite v Oracle RAC 11.2

        • 1. Re: Red Hat Cluster Suite and Oracle RAC
          Sebastian Solbach -Database Community-Oracle

          first of all Red Hat Cluster Suite cannot replace the RAC functionality. RAC is database Red Hat Cluster Suite, just provides clusterware. So all with what you will end up is a plain old failover cluster solution.
          So in maximum Red Hat Cluster Suite can replace the Oracle Clusterware. (But not below a RAC, since this is not supported and even with integration with other clusterware Oracle Clusterware will still be there).
          So what he will end up is also replacing RAC with single instance databases in a failover cluster solution, and with this will decrease a lot of RAC capabilities:
          => Rolling Upgrade (OS / Clusterware and some database patches)
          => Storage migration/consolidation
          => Fast failover (30 seconds vs. minutes).

          See www.oracle.com and you will find whitepapers with differences between failover clusters and RAC.

          But even if there are other justifications to reduce availablity (which actually can only be costs), I still wonder, why he wants to replace Oracle Clusterware - the clusterware shipped with Oracle is far more mature than the one from the Red Hat cluster Suite.
          And there is no better integration for Oracle databases in clusterware than what Oracle clusterware can provide.

          Even more so, OCW is a full capable clusterware and you can build your own failover cluster solution for free.
          The same would have to be done if he replaces it with redhat cluster.

          PS: If someone is providing failover scripts for Oracle in Redhat clusters, it will be Redhat (but I think you have to write them yourself).

          • 2. Re: Red Hat Cluster Suite and Oracle RAC
            user589812 wrote:

            Our boss will plan to configure Red Hat Cluster Suite to replace to update oracle RAC.
            Not a good idea. That is where RAC's forerunner, OPS or Oracle Parallel Server, was at.

            OPS came without a cluster s/w stack. The o/s vendor provided that.

            This solution was often problematic. Not always that robust. Different vendor stacks behaved differently making diagnosing problems difficult. Problems had to be dealt with using 2 separate vendors support centres (that at best do not talk to each other, at worse point fingers at one another).

            To address this mess, Oracle developed CRS (<i>Cluster Ready Services</i>)/Grid Infrastructure. This eliminates vendor issues (like implementing "standards" differently). Provides a common and tightly integrated platform for running RAC on. Enables you to get your RAC and Grid problems addressed and solved by a single vendor and support/maintenance contract. Etc.

            Reverting back to the old approach of using different vendor stacks for grid and RAC? I fail to see any logic or sound reasoning backing this up.

            Fact. It WILL cause problems. It WILL result in a lessor robust s/w stack on that server.

            It WILL be a major mistake on your boss's side...
            • 3. Re: Red Hat Cluster Suite and Oracle RAC



              I have a somewhat related question.  We are looking to migrate from Red Hat 6.2 with Red Hat Cluster Services to Oracle Linux 6.2 with Oracle Clusterware.  Is there a process or methodology to do this?  Any insights, best practices or use cases would be fantastic.

              Thank you!

              • 4. Re: Red Hat Cluster Suite and Oracle RAC

                Please ask your questions using your own thread. You will own your question and you will reach a wider audience.


                It is bad netiquette to resurrect an old and dead thread like this one. And just as bad to hijack another person's thread to ask your questions.

                • 5. Re: Red Hat Cluster Suite and Oracle RAC

                  Moderator Action:

                  This long abandoned zombie of a thread, resurrected by a hijack post, is now locked.

                  Let it return to its slumber.


                  Grabbing someone else's thread for one's own question is very poor forum etiquette.