Currently I am in a S/4HANA 1909 upgrade project (source 1809 system). I have depicted a quick overview for a better understanding, as there were comments on it.
I was curious in trying out the new announced feature called Silent Data Migration Infrastructure (SDMI). It allows you to migrate application data during uptime, that means during that time you can use the system productively. Thereby, the duration of the downtime can be reduced.
Within SUM 2.0 SP6 (PL1) select the following option: Downtime-optimized
or via automatic creating within SUM.
After a while in the online S/4HANA 1909 system it looks like this:
UPDATE: Recently I was informed about a Simple Finance example, that uses SDMI.
Introducing a new field ACRVALDAT for table ACDOCA: The new field is created empty during SUM upgrade to SAP S/4HANA 1909. Afterwards, business continues as usual – without impact on business processes, and silent data migration fills new field in background (via SDM User).
UPDATE 2: Another Example for SDMI in the Finance area.
The field RAR_VERSION_CODE in table FARR_D_CONTRACT does not yet exist. The new field RAR_VERSION_CODE on contract level indicates whether the contract has been created in a “Revenue Accounting Classic” or in the new “Revenue Accounting” environment. It will be needed (and automatically introduced) in release “On Premise 2020” and it is highly advantageous to introduce and populate it already in current release “On Premise 1909” as a preparation for upgrade to release “On Premise 2020”.
UPDATE 3: Downtime comparison (a rough try)!
I was able gain experience in two similar Upgrades from 1809 FPS2 -> 1909 Release. One scenario used the standard SUM option and the other one was using downtime-optimized plus SDMI enabled.
Although the systems are not exactly the same (db size, languages, available processes, etc.) you can see that downtime optimization can save a lot of downtime (which I will not comment any further)…
In SUM Analysis SAP calls it “Minimum downtime” and you can see the difference. You can learn more about it in the following blog: https://blogs.sap.com/2019/05/27/sum-2.0-post-processing-import-of-additional-software-and-transports/
SUM standard: 7:55h
SUM downtime-optimized: 4:45h