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SAP system with HANA, Memory requirement for BW CI/App servers

Hi,

I have a question around hardware requirement for app servers/Central servers with regards to SAP with a HANA database.(BW)

I've looked at some benchmarks for SAP BW Enhanced Mixed Load (BW EML)

http://global.sap.com/solutions/benchmark/bweml-results.htm

I've noticed that application instances on the HANA systems are also spec'd with the same amount of memory as the database servers.

I understand that HANA is in-memory DB and needs large amounts of memory, but is there a reason for the application servers?

Update;

I see there is a note on HANA sizing, but no mention of the CI/Application servers;

1514966 - SAP HANA 1.0: Sizing SAP In-Memory Database

Kind Regards,

Chris

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