BW HANA Sizing - Results interpretation /SDF/HANA_BW_SIZING

[FOA]

How should the results of the report /SDF/HANA_BW_SIZING be interpreted? is the recommended physical memory per node the final "HANA DB size" also displayed in the Readiness check report? It is very confusing as the sum of the memory 838 GB + data 1271 GB + log 512 GB disk size, is not equal to the recommended physical memory per node (1536 GB). 

Thanks for any clarification.

 

[RolandKramer]

Hello @FOA 
as you can see, the sizing Report shows that the System can hold comfortably in a 2 TB Node, as you shoud try to avoid to split into several nodes.

once the system grows regulary, try to consider to use Dynamic Tiering or nearline storage (NLS) as alternative for the historical data to keep the main memory in balance.

See also SAP BW NLS Solution and why SAP BW/4HANA?

best regards Roland SAP first-guidance

[FOA]

Hi Roland, thanks for your notes. I would be curious to know a point of view on what is stated in the document SAPBW4HANA_Sizing_V2.7.pdf, in note 2296290. Page 36:

1. The size of the data files will be approximately as large as the overall memory requirement.

2. Small systems (< 512 GB) require half the memory size for log files. For all other systems a
total of 512 GB for log files should be enough.

3. For executables, dumps, exports, etc. we recommend reserving at least 2x-3x the total
memory requirement.

Which in my example would be:
1. 838 Memory requirement + 838 for data = 1676
2. 1676 + 512 = 2188
3. 2188 + (838 x 2) = 3864,

This would lead to a Hana DB tier of at least XL (3072 GB). Meaning once size bigger than the recommendation of 2 TB. Would you agree that the recommended physical memory of the report is not sufficient and the above points need to be considered? Or not at all?