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SAP system over MS SQL Failover Cluster

Hello,

I´m with big doubts regarding the SAP installation that we want to perform!

We want to install a SAP system (ERP) in one application server/host (message server) and the database of this SAP system in other host (Database server) configured with MS SQL Failover Cluster.

It´s possible to do that? Because I want to perform a SAP distributed installation but the database is in MS SQL Failover Cluster... so my question is what is the installation option that I must choose in Software Provisioning Manager?

Best regards,

samid raif

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4 Answers

  • Posted on Feb 12, 2015 at 07:27 PM

    Hello Samid,

    Of course it is possible to install SAP system on MS Failover Cluster. And I advise you to install your production system on a cluster /High Available) system.

    You need to follow the Guide "INSTALLING SAP SYSTEMS BASED ON SAP NETWEAVER 7.1 AND HIGHER - USING SOFTWARE PROVISIONING MANAGER 1.0"

    And in this guide follow planning, preperation, Installation and Post Installation sections in order.

    The information about failover cluster is in section "8 High Availability with Microsoft Failover Clustering".

    Below figure is taken from the mentioned guide. You can built up your system like this. DB runs on one node and SAP MS runs on another node of the cluster.

    Regards,

    Yuksel AKCINAR


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  • Posted on Feb 12, 2015 at 09:19 PM

    Hi Samid

    Yes, You can install the CI, DI & DB in all three different systems

    1. CI & DB - you can refer the SAP distributed installation guide. During the SAP installation DB you have to select the Cluster Virtual name.

    2. DI normal additional application server installation steps

    In our environment we have do it all Dev & Qty system single DB in the cluster.

    BR

    SS

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    • Hello samid,

      Yes, of course it's possible.

      You have to choose the "High Availability" option for the phase "Database Instance" in the database server (with the Microsoft Failover Cluster), and choose the "Distributed Installation" option for the all the other phases "ASCS Instance" and "Primary Application Server Instance" in the application server (where you want to install the SAP instances).

      Best regards,

      João Dimas

  • Posted on Feb 16, 2015 at 01:29 PM

    Hello Hamid,

    Why would you do such a configuration ? The reason I think ASCS (or SCS) is included in the cluster is to ensure that when your DB fails over to secondary node, your message server and enqueue information fails over too, to maintain consistency, since although at higher level the cluster name maybe used for db connection. I doubt that at operating system call level cluster name/groups may not be used, all files are treated as file handle numbers at operating system level.

    I would suggest you raise this to SAP via OSS and ask them for advice.

    Regards,

    Siddhesh

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  • Posted on Feb 24, 2015 at 01:28 PM

    Hi all,

    The scenario described by Samid is valid, and there is no need to mix the 2 SWPM installation methods. You should use only the "Distributed Installation" method.

    I think that you biggest concern was related to the fact that on a SQL Server AlwaysON Availability Group, there is no shared volumes and in case of failover how SAP folders will be replicated, right?

    I just finished a lab to probe that there is no SAP folders/files installed by SWPM on the SQL Server nodes. Please see my document here: SAP NetWeaver on SQL Server 2012 AlwaysON for HA and DR

    Regards,

    M

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