Moving SCS/ASCS to different hosts

A little background to this document.  In our environment the Central Services (ASCS and SCS) are currently housed on the same server as our Database.  This database server is in a secluded (via firewall) network zone.  For certain upgrade activity we have found it necessary to move the ASCS and the SCS on to the same server as our Central/Primary Instance.  We were not able to find any documentation online on how to accomplish this.  Through trial/error we developed our our procedure, which I would now like to share with the community.  Our environment is a UNIX one.  Adjust accordingly for Windows/other.

These instructions have been used/tested on NetWeaver 7.0, 7.02, and 7.3.

Definitions

Primary or Central Instance - In this document I will often be referring to the Primary or Central Instance.  This is meant to refer to the instance DVEBMGS*.  For the purposes of my document, these terms should be considered synonymous.

Central Service - ASCS and SCS.  Generally enqueue and message services.

1. On the Central Instance application server make a backup of the entire /sapmnt/<SID>/profile directory (cp –R /sapmnt/<SID>/profile /sapmnt/<SID>/profile.bak).
2. Move the ASCS and SCS profiles to the Central/Primary Instance Server.
3. Using tar/zip, move /usr/sap/<SID>/(ASCS##|SCS##) from the source server to the target server.
4. In our environment the ASCS and the DVEBMGS instances have the same number (They are on different servers).  If this is the same in your environment, make sure to rename the /sapmnt/<SID>/profile file(s) to a new (unused) number.  The ASCS/SCS folder(s) in /usr/sap/<SID> will also have been be renamed with the same corresponding number.
5. In /sapmnt/<SID>/profile, edit the DEFAULT.PFL.  You will need to change any value that relates to the Enqueue/Message service.  If you changed the instance number of the ASCS/SCS, you will also have to reflect these changes in the appropriate entries in DEFAULT.PFL.  Pay special attention to Port numbers and host names/IP addresses.  If you are a bit lost on the port numbers, this SAP Document on TCP port numbers may come in handy.
6. In /sapmnt/<SID>/profile, change values in <SID>_DVEBMGS##_<Server> as required to reflect the location of your new cental services.  In our environment, no changes were needed here as this is entirely defined in our DEFAULT.PFL.
7. In /sapmnt/<SID>/profile, change values in <SID>_ASCS##_<Server> and <SID>_SCS##_<Server>, similar as you did in Step #5.
8. In /sapmnt/<SID>/profile, change values in START_SCS##_<Server> and START_ASCS##_<Server>, similar as you did in Step #5.
9. Rename <SID>_SCS##_<SourceServer> and <SID>_ASCS##_<SourceServer> to <SID>_SCS##_<TargerServer> and <SID>_ASCS##_<TargerServer>, respectively.  Be sure to pay attention to CaSe SeNsiTivItY.  On UNIX environments, the "hostname" command will provide you with the expected host name and case.  Change the ## as appropriate, if required.
10. Rename START_SCS##_<SourceServer> and START_ASCS##_<SourceServer> to START_SCS##_<TargerServer> and START_ASCS##_<TargerServer>, respectively, similar to step #9.
11. In systems that have a java stack, open ConfigTools.
    1. Under Global Server Configuration and Global Dispatcher Configuration open up manager/cluster manager and in the fields ms.host and ms.port change to desired values. Also change “Managers/Locking Manager” enqu.host and enqueue.port
       
    2. After you complete the changes on the first screen, proceed to the File|configuration editor and scroll down through cluster-data|Propertysheet instance.properties and look for the instance.properties option. Click the pencil to enter edit mode.  Change the following to new, appropriate values:

       1. Instance.en.host

       2. Instance.en.port
       3. Instance.ms.host
       4. Instance.ms.port
    3. Save your changes and exit Config Tools.
12. In systems that have a java stack, you need to tell the SDM of the new central service location.  If you fail to do this, the java instance will not start up.
    1. cd /usr/sap/<SID>/DVEBMGS##/SDM/program
    2. ./sdm.sh jstartup mode=standalone (SAP System may need to be down?)
    3. ./sdm.sh registerjstartup sdmhome=/usr/sap/<SID>/<Instance>/SDM/program/ jstartupdir=/usr/sap/<SID>/<Instance>/exe/ mshost=<TargetServer hostname> msport=<Port Of Message Server>
    4. ./sdm.sh jstartup mode=integrated
13. Start SAP System.  Check /usr/sap/<SID>/<Instance>/work/dev_server0 to ensure the java stack comes to "Running".

To move the Central Services back, simply restore the backup you made in step #1 above and undo the changes you made in Steps 11/12.