New BW 7.0 System (ABAP+Java) as two single-stack Systems? How?

Hello,
as of the current recommendation not to install a dual-stack system anymore, we are planning to setting up our new BW 7.0 sandbox-system as two single-stacks.
In my understanding, I have two install two separate systems (1. AS ABAP, 2. AS JAVA) and connect them each other. So each system should have it's own SID?
Procedure: I first have to setup the AS ABAP with SID=NWA and then afterwards setup the AS JAVA with SID=NWJ - and connect each other afterwards (e.g. RSPOR_SETUP and so on...).
Or am I allowed to use the same SID(=NWA) also for the AS JAVA (as it is in a dual-stack installation)? If so, am I allowed to use the same system (OS will be windows 2008) for them? In the Installation Guide I found for NW 7.0 EhP2, they still mention the dual-stack installation...
So, if you have a dual-stack installation, it looks like this:
Host: nw.sap.company.local / SID: NWA, Instance: 00 (AS ABAP) + NWA, Instance: 00 (AS JAVA)
How should it look now? Like this:
1. Host: nw.sap.company.local / SID: NWA, Instance: 00 (AS ABAP) + NWJ, Instance: 00 (AS JAVA)
2. Host: nw.sap.company.local / SID: NWA, Instance: 00 (AS ABAP) + NWJ, Instance: 01 (AS JAVA)
3. Host: nwa.sap.company.local / SID: NWA, Instance: 00 (AS ABAP)
+ Host: nwj.sap.company.local / SID: NWJ, Instance: 00 (AS JAVA with EP_CORE, BI_JAVA, ...)
In case of option 3, do they have to use their own DBMS?
Thanks in advance!
BR,
Markus

Hi Oliver,
thanks for you reply!
>
Olivier CHRETIEN wrote:
> Yes, each system (abap and java) will have its own SID.
> If you have sufficient hardware ressources, it is possible to install these 2 systems on the same physical host.
It's virtualized using XenServer, so I can decide to use a "large" system/virtual machine containing both ABAP and Java or to have two separate systems/virtual machines... I prefer the second solution (each with it's own DBMS/MSSQL2008) even if it's a "waste" of resources in comparison to a dual-stack system (2x OS/Windows, 2x DB/MSSQL-Server).
> You could also use MCOD to use only one database instance with 2 schema but I personally don't like this solution.
> The key to not install anymore as a dual stack system is to have independency between java ans abap.
I had a look at this also... I think there are no advantages (beside resources), because when you have to do some maintainable at the DBMS (e.g. OS updates), more than one system is affected.
> The installation will be more complicated than a dual stack but it will be easier to manage, be more reliable, easier to patch and upgrade.
Maybe, but you need an additional (hardware-)resources - as seen above. But anyway, thanks. We will try with separate hosts.
Regards,
Markus

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