Switch over between two SAP PI systems for downtime minimization

Hello Colleagues,
with our interfaces over our SAP PI 7.31 (ABAP/Java) system we assume we will run in a 7x24 h runtime scenario in the future.
Regarding Business Continuity we have to think about solutions which help us to handle downtimes greater than 15 min. regarding Support Package upgrade, Kernel update, EHP, etc.
The first idea is to implement a second equal SAP PI productive system in parallel to the existing one.
On the sender side a switch over implementation like WebDispatcher, Load Balancer, etc.
For maintenance all Interface traffic can run over PI Nr. 1 and PI Nr. 2 can be updated.
Afterward all interfaces will switched to PI Nr. 2 and PI Nr. 1 can go in maintenance.
Could be this as suitable solution for SAP PI Business Continuity or do you know better solutions?
Many thanks in advance!
Regards,
Jochen

Hello Bernhard, Hello Holger,
many thanks for reply and providing these valuable information's.
The nZDM Concept is already known to me but it doesn’t answer all our questions.
Please let me explain a little more in detail.
Not currently but in the near future we assume some new interface over our SAP PI System will come with the requirement max. downtime lower thank 10 to 15 min. only allowed.
To be prepared regarding this possible scenario, we start thinking about possible different solutions.
First step was the nZDM Concept, of course. But it didn’t meet all our requirements regarding interface downtime.
Some points are:
possible min. downtime is 30 min. and thus is over our requirements for interfaces
only for Update (and planed for Upgrade) the SAP PI application
all operating system and database related maintenance tasks are not covered by nZDM
all Hardware (Server, Storage, etc.) as well not covered by nZDM
Among others, because of these facts we start thinking about a second equal SAP PI system beside to existing productive one.
Than line 1 will take over the whole interface traffic and in the meantime the line 2 can go in maintenance. After finalizing the maintenance for SAP PI Nr. 2 we can switch the interface traffic to SAP PI Nr. 2 to get SAP PI Nr. 1 free for maintenance.
Regarding the topic “PI Federation” I found here in these documentation's several hints regarding this scenario (two SAP PI systems in an switch over scenario).
PI Federation – An Overview
among others Page: 27
Business Continuity: Central PI integration Server with redundant Integration Server to be used in controlled switch over scenarios when upgrading or patching.
or
How to Fast-Switch Integration Scenarios between SAP PI Runtimes Part II: Web Dispatcher
But I didn’t found any further detail documentation's regarding this approach.
The solution should fit as well to our existing hardware infrastructure.
For production we use an IBM (AIX) failover-cluster switch between our both data center.
Regarding our hardware infrastructure prerequisites and downtime requirements, which solution(s) do you recommend? Is PI Federation still an option?
Many thanks in advance!
Regards,
Jochen

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Switch over between two SAP PI systems for downtime minimization

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