PI 7.1 Dual stack to PI 7.4 Dual stack upgrade

Hi SAP friends,
We are planning to upgrade PI 7.1 (Dual Stack) to PI 7.4 (Dual Stack). Please suggest best way to do this:
In-place upgrade PI 7.1 to PI 7.4 (Dual Stack)
New Install PI 7.4 (Dual Stack) and migrate the contents from PI 7.1
Thanks
Vikas

Vikas
There is no hard and fast rule and it depends on a lot of factors within an organisation. Refer to the following official guide from SAP on the various factors to consider, then you would be able to come up with the best decision for your organisation.
Decision Making Factors when Moving to SAP NetWeaver Process Integration 7.3 - Upgrade or New Installation with Phase-ou…
Rgds
Eng Swee

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Communication component in ID is the same as sender side.
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Short Text
AS Java Stack as Add-in to ABAP Stack
Long Text
Hi
We are upgrading from SRM 3.0 to 5.0.
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AS Java Stack as Add-in to ABAP Stack

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Hello SAP,
I am a business partner who specializes in infrastructure consulting for SAP solutions. The SAP Consultants I am working with recently have been recommending that customers install single stack systems. I would like to know why? Are there problems with dual stack systems? Is SAP changing things in a later release and they want customers to be prepared for the change?
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I am a business partner who specializes in infrastructure consulting for SAP solutions. The SAP Consultants I am working with recently have been recommending that customers install single stack systems. I would like to know why? Are there problems with dual stack systems?
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- System copies via R3load - if you want to copy a huge system (let´s say ERP 6.0 + Java stack) you need to use sapinst + R3load to do the copy. Imagine if the system is 1 TB or bigger, this is very time consuming
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- interdependencies - example: you run ERP + EP + BI-Java on one system. You upgrade your BI (which is on a different box) to a new support package. Since the BI-Java need to be in sync with the BI ABAP support package you need to upgrade the EP too - and since there´s a direct dependency (doublestack system) you will need to install support packages on your ERP. So you finally end up in having dependency chains that a total different system (BI) will force you to upgrade/patch your ERP. And if you have e. g. a CRM connected to the same EP you will need to patch that too...
Is SAP changing things in a later release and they want customers to be prepared for the change?
No - the possibility of having a dual stack installation will be still there.
From an infrastucture point of view this recommendation combined with SAP NetWeaver architecture will result in an explosion of SID names which leads to an explosion of application server instances and DBMS instances and an explosion of installed servers. I know it is possible to combine SIDs into a single DBMS using MCOD and to have multiple application servers in a single physical server, but there are issues with mulitple application server instances and MCOD use which make normal maintenance operations difficult.
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I think it would be much better for customers to install dual stack systems and simply adjust the SAP profile parameters to disable one stack or the other. This way, you could still have 1 stack per application server instance and you would not be have to be creative with SAP SID names!!! Creating a DBMS instance or installing an additional server is not a simple nor economical proposition.
There are 36 * 36 * 36 (minus a few reserved) names for SIDs- this should be enough - also for the biggest customers
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