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Former Member

Remove SAP from MSCS HA and vice versa

Hi Guys,

We would like to remove our current SAP J2EE CE 7.11 from our MSCS HA cluster and make it a standalone system, so we can perform an in-place upgrade of MS 2003 to MS 2008. Once the upgrade is complete we would then like to add this system back into a MSCS HA.

I was wondering if someone else has done something similar?  I guess it boils down to two questions:

1. Can an SAP system be removed from a 2 x node HA cluster and run without issue on a single server? (HA option selected at install)

2. Can a fully installed SAP system running on a single server be turned in a HA cluster by adding the cluster services and an additional server?

I know export/import is the preferred option - but due to our landscape the above migration method is preferred by the business.

Regards,

Cillian, 

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4 Answers

  • Best Answer
    Mar 28, 2014 at 05:30 AM

    Hi Cillian,

    I guess inplance upgrade from MS 2003 to MS 2008 is not possible directly. Please refer blog  below for details.

    http://blogs.msdn.com/b/saponsqlserver/archive/2010/10/04/sap-now-support-in-place-upgrade-of-windows-for-sap-systems.aspx?Redirected=true

    Also you may need to check PAM for OS/DB platform support for SAP application before you plan for MS upgrade.

    Hope this helps.

    Regards,

    Deepak Kori

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  • Mar 28, 2014 at 07:49 AM

    Hi

    Kindly follow the steps

    before removing the MSCS

    1. Setup the standalone SAP J2EE CE 7.11, Check every thing are working fine.

    2. Discard the MSCS  2003 environment.

    3. Do the fresh installation of Windows 2008 R2 with MSCS along with DB, before that check the PAM version support http://services.sap.com/PAM

    BR

    SS

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    Former Member
    Mar 28, 2014 at 08:50 AM

    Hi,

    please be aware of the different IO architecture in Windows Failover Clusters as of Windows Server 2008. 2008 and later are using SCSI Persistant Reservations. Devices used in 2003 for cluster disks must support this feature otherwise you are not able to use them as cluster disks.

    Furthermore (if you can use them) I am not sure whether you will be able just to "mount" them into the 2008 or later Cluster. It may happen that you need to reinitialize them in order to use them as clusters disks on 2008. In this case you need to copy the contents of the old disk to the new cluster disks  - not really in-place like procedure.

    kind regards

    Peter

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    Former Member
    Apr 25, 2014 at 10:54 AM

    Hi All,

    Thanks for you're helpful comments - it looks like the business are willing to go ahead with the recommended export/import. I think it will cause less hassle - hopefully 😊

    Regards,

    Cillian

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