Installation of SAP Standlone Instance in SAP Clustering NODE

[Former Member]

Hi,

Our SAP Portal is on Fail over Clustering on Windows 2008 Server with MSSQL 2008 Database. We have Two NODES i.e., NODE A and NODE B. And the SAP Clustering is working perfect.

Is it possible to install another SAP Instance as a standalone instance on running SAP Cluster NODE B? If so, I have Questions

1) Do I need to install MSSQL 2008 Database Software as a standalone then install the SAP Instance? If so Will there be any inconsistencies?

2) Suppose I have installed another SAP Instance as a Standalone in NODE B.

Will there be any inconsistencies while doing the swtichover (moving the resources of NODE A to NODE B)?

Will the SAP Portal Clustering work without any issues after the installation of another SAP standalone instance in NODE B?

Kindly express your ideas and experience.

Regards,

MNA

[Former Member · Accepted solution]

Hi,

Assuming you did your SAP installation as recomended in the installation manual you have Node A with CI and SCS and/or ASCS then Node B with RDBMS and Dialog instance. So know you ask if you could install another standalone instance in node B.

1.- If this is a productive system SAP do not recomend this and personally either because this could cause serious performance problems and also maintenance problems too.

2.- As per your question, you could install this using the same RDBMS and it is not necesary to install another standalone Database (this is called MCOD) but again this is not recomended in Prod. systems.

3.- You will be able to have your standalone system working as long as the cluster system does not switches RDBMS from node B to Node A. If system in Node A fails over to node B then you will have performance problems, not inconsistencies because both systems has their own system number and database part but again an SAP system installed in cluster environment is not intended to work as you require.

4.- Remember that if you installed the SAP HA as per the Guide, then Central services in node A is what is going to move to Node B (if Node A fails) and RDBMS in Node B is what is going to move to Node A (if Node B fails).

Regards,

[Former Member · Accepted solution]

Hi,

If you have any notes, which will be very helpful to me as a reference.

Regards,

MNA

[Former Member · Accepted solution]

Hi,

Most about I wrote is in the installation guides in the section for HA installations in MSCS, I also recomend reading the document following this link:

http://www.sdn.sap.com/irj/scn/index?rid=/library/uuid/50a1b7a6-8307-2a10-05bc-d4388cbd4201&override...

also SAP note for MCOD 391540, 388638, for multiple SAP Systems in one server the please read SAP note 28392, also 1321854.

If you decide to do another installation then take a in depth read to the installation guide where you will find how to do it correctly but be aware that if the Prod nodes sizing was not intended for two systems you will probably need to do some changes to Hardware.

Regards,

[Former Member]

<pre class="jive-pre"><code class="jive-code jive-java">1) Do I need to install MSSQL 2008 Database Software as a standalone then install the SAP Instance? If so Will there be any inconsistencies?

</code></pre><br />

<br />

&gt; <b>No need to install SQL server once again</b><br />

<br />

<pre class="jive-pre"><code class="jive-code jive-java">Will there be any inconsistencies <font color="navy"><b>while</b></font> doing the swtichover (moving the resources of NODE A to NODE B)?

</code></pre> <br />

<br />

&gt;<b>When switchover occur Inconsistency will be there.</b><br />

<br />

Regards<br />

Santhose