Memory Pools on AS/400 for SAP Memory Management

If with Transaction ST06 or on the CCMS Alert Monitor you notice a high paging rate in a memory pool, enlarge this pool.

• Machine Pool: This is always system pool 1.

The paging rate should be less than 10 faults per second.

• Other pools: The paging rate should be ideally less than 200 faults per second.

The following example can help you when assessing paging rates in your system:

Faults in the memory pool used by R/3	200 faults per second
Number of active work processes (not the total number of work processes)	10
Average number of faults per work process	20 faults per second
Paging overhead (assumed average response time of the hard disks is 10 millisec.)	200 millisec. per second

This corresponds to a paging overhead of 20%. Do not exceed the 20% limit.