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1 or 2 S/4HANA instance architecture?

Austin1000x
Explorer

‎2025 Jan 17 1:48 AM - edited ‎2025 Jan 17 3:35 AM

5,747

Hi, we are exploring a 1 or 2 instance strategy for a S/4HANA private cloud architecture. 

We have an SAP S/4HANA Private Cloud - Utilities (Meter to Cash) instance that we use for customer billing.  We also have a legacy ECC 6/HANA instance supporting Finance and Supply Chain processes and are planning on upgrading this instance (conversion) to S/4HANA private cloud in the future.  

Is it better to have an architecture of 1 or 2 S/4HANA private cloud instances in this case?  

Thanks.

3 REPLIES 3
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TammyPowlas
SAP Mentor
SAP Mentor

‎2025 Jan 17 11:33 AM

5,649

I would think you would have one production instance with Meter to Cash and Finance in the same instance.  The "cash" part is likely the biggest source of Accounts Receivable and one instance makes auditing finance easier.

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Austin1000x
Explorer

‎2025 Jan 17 4:15 PM

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5,625

Thanks Tammy!!  I really appreciate your feedback.  

So you think for our future state we should migrate the ECC/HANA instance (finance and supplychain) to our existing S/4HANA private cloud (with Utilities) to simplify the architecture and support?  Do you think there are any benefits of keeping the S/4HANA instances separate in the future state? 

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PieterB
Participant

‎2025 Feb 03 8:08 PM

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5,513

Hello @Austin1000x,

the discussion depends on what you are doing today with the legacy ECC, which license mode, what you want to keep as legacy data, .... So I have listed some questions which could help you to define the best scenario: 

  • Is your current S/4HANA integrated with the ECC for doing the financial posting (aggregated postings from FICA)? If no, does this mean that S/4HANA has its own Finance processes in place?
  • Is there a need to integrate more than 1 customer billing system towards the S/4HANA Finance system?
  • Are you considering Rise for SAP or are you already on Rise for SAP?
  • Do you have a 3-tier, 4-tier, ... landscape?
  • Is there a need to simplify the Finance set-up (e.g. consolidation of company codes)?
  • Do you want to migrate historical data from the ECC instance? If yes, all data or only selective data?

Of course I am happy to share my opinion about this topic, when I get some answers / extra info about the current instances.

Cheers,

Pieter