SAP on Power

SAP on Power

IBM Power servers are purpose built for data-intensive applications such as SAP HANA and S/4HANA that require large amounts of in-memory computing but still let you maintain the high availability and flexibility required for your hybrid cloud. 


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AIX: Active Memory Expansion for SAP applications

By Harald Duvenbeck posted Thu March 23, 2023 02:00 PM

  
Active Memory Expansion (AME) is a Power technology that is unique to AIX. With AME you expand your memory without having to spend real memory for an AIX logical partition. See this White Paper on how AME works with SAP workloads:

Using AIX 64K Active Memory Expansion with SAP

What are the main benefits of AME for SAP applications ?

The most obvious benefit is cost savings - you can run your AIX server with less memory than would otherwise be required by the application.
In another usage scenario,  AME can act as a safety net against unexpected memory demands.  For details see the White Paper.

What is new ?

Previously, AME was only supported in the 4K variant for SAP, but this limited the effectiveness of the expansion operations. 64K page sizes have been supported by AME for some time but now they are also supported for SAP workloads. See the recently updated SAP Note 1464605 Active Memory Expansion (AME).
In the White Paper, the SAP SD Benchmark workload was used to verify and optimize AME on Power9 and Power10. The paper lists the results and gives valuable recommendations how to find an optimal AME configuration for your SAP workload.
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