Migrate dual stack to ABAP only

We have a dual-stack NW700.
We only want to export its ABAP portion and then use the export to build a new NW700 ABAP only.
1) is this feasible (i.e. the traget system will run? It's OK run without JAVA functionality as long as it runs)
2) if so, on sapinst , should select "system copy-> oracle->central system->system based on ABAP"
OR
"system copy-> oracle->central system->system based on ABAP + JAVA" ?
Thanks!

Hi Jessica,
You don't have to export the database.. Removing the java schema from the database is sufficient.
The installation guide explains how to remove a java add-in from a dual stack system.
Basically you do a drop user cascade from the java schema, remove the java software and delete the java specific parameters from the instance profile.
Kind regards,
Mark

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The ABAP stack is sucessfully patched yet,
but the Java stack needs still to be patched!
In the SPS guide for SPS 9 and some OSS notes you can read that during the patching of the Java stack, the whole system (ABAP and Java engine) are restarted several times. But the JSPM should ask you before the restart.
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How often needs the system to be restarted?
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Best regards,
Stephan

Hi Stephan,
"Do you have experiences how long the patching of the Java stack will take (downtime)?"
I believe this is most highly dependent on the hardware. Although some patches will deploy more objects than others, the deploy time is shorter on better/faster hardware. I applied SP9 on my laptop PC (java only, no ABAP stack) and it took a few hours total -- including my processing and error correcting time. My laptop has only 2 GB RAM so this process was greatly slowed by the amount of available memory (I was running other applications, like Outlook, etc.) resulting in a lot of disk swapping.
"How often needs the system to be restarted?"
Again, I have a java only installation, no ABAP, but I believe there was only 1-2 system restarts. The system had to be restarted after the application of the java kernel part of the patch, then shutdown and restarted again for the offline deployment phase. I cannot remember if there was a restart after the online deployment phase.
"Is it possible to work with the ABAP engine (ABAP development, etc.) during the installation of the Java SPS with JSPM until the system needs to be restarted?"
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"How is it possible to minimize the downtime of the system during the Java SPS installation?"
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SAP BI 7.4 ABAP Only, Do i need Java stack

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Hi,
I have configured the CHARM for Dual stack ( Java, ABAP). when I perform the action 'Logon to System' it gives me following option
" The system is a dual stack system. You can log
on to the ABAP stack or non-ABAP stack
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ABAP or Non ABAP"
If I click on Non ABAP, one more message comes
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Edited by: PK on Sep 1, 2010 5:59 AM

Its possible to login to portals(non-ABAP systems).
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http://wiki.sdn.sap.com/wiki/display/SMSETUP/Initial+Configuration
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Hi
Can any body please provide step - by -step procedure.
Thanks in advance
Edited by: Kobby bryant on Apr 13, 2008 10:39 PM

Hello Koby,
Dual stack is ABAP+Java instance.
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Using the installation wizard, you could select the desired option and the installation is performed accordingly.
If you are looking for any specific info, please provide the details.
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Snehal

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if i use stopsap r3 in this dual stack installation - it stops both ABAP & JAVA Web Application Servers.
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But theoritically they are 2 indpeendent installations like
AS ABAP
AS JAVA
..Do you aggree ?? really am not good on basics!!
During the installation also - if select AS ABAP & AS JAVA - it will become dual installation
and it does not show
any dependency while installing that AS JAVA requires AS ABAP.[Installation Component Selection and Dependency Screen shot|http://i303.photobucket.com/albums/nn153/S0002919350/SAP%20Issues/Oracle_Patches.jpg]
Installation Component Selection and Dependency Screen shot
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Regards
Edited by: P.R. SRINIVAS on Jun 16, 2008 4:15 PM

Restart the Java-Engine in a dual stack installation (java+abap)

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Hi Eric,
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sharam

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Hi,
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Web Dispatcher will connect to the ICM of that instance, and the ICM is talking to Abap dispatcher and J2EE Dispatcher.
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Amar.

> But you can install PI, and then deploy all the other SCAs with JSPM.
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Hello SDN!
We are thinking about to separate our Dual Stack ERP 6.00 System on Windows/Oracle in two stand alone system Java und ABAP. Wie have afew small implementation in Dual Stack such as ESS and wie have no modifications at all.
Has somebody an expiearence with that? Knows somebody about some tools for such an action?
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With best regards
Vladimir

You may find attached link helpful and interesting
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> We are using the NFS filsystem. its mounted the two systems.
Good!
> Can i know which ExchangeDir we need to use.
>
> i saw two of them
>
> 1. NetExchangeDir
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Java Stack Vs Dual Stack in Pi 7.3

Hi experts.
I open this thread because I'd like to know your opinion about the newJava installation option in SAP PI 7.3. In previous realeses (7.0,7.1) I felt more comfortable and safe in abap stack and I'm a little afraid about working only with java stack.
I'd like to know advantages and disadvantages to choose java stack instead of dual stack, why you'd choose one of two options or both in your nexts customers.
Thank u so much and happy new year!!!!

Java Stack or Dual Stack in 7.3
Java Stack alone: Almost all standard adapters including HTTP, IDOC and Proxy are all available in this stack. you need to use Integrated Configuration object for this. You are basically going to use Advance Adapter engine alone for the entire processing.
Pros:
No persistance steps here. So you would improve performance many folds for sure.
Throughput is also improved very much.
since 7.3, Solution Manager is available for monitoring inaddition to RWB and NWA. So monitoring would not be issue.
If you are looking for real performance improvement, Single stack Java to go.
Cons:
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Message split to multiple receivers are not completely supported.
BPM interfaces are not seamless migration here. SAP 7.1 and lower versions support BPEL wheras 7.3 supports BPMN standards. So you might have to tweak a bit to modify existing interfaces here
Dual Stack:
Your option is pretty open. If you need some specific interfaces to handle only java stack, still that is possible and increase the performance. Also if you have lot of existing interfaces that requires BPM interfaces, ABAP mapping , Multiple split /branching etc.
still dual stack is the better option now. Here developer decides according to the requirement.
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Migrate dual stack to ABAP only

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