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IBM SAP Alliance
Active Memory Expansion & Active Memory Sharing
Active Memory Expansion
� Effectively gives more memory
capacity to the partition
� “memory expansion”
– Efficiency depends on compressibility
of in-memory content
� AIX partitions only
� Easy initialization via HMC
� Instantaneous effect when activated
� Potential of HW assistance
� Permanently requires few CPU cycles
23 ISICC Walldorf - MK, 09/2010
Active Memory Sharing
� Moves memory from one partition to
another � “memory pooling”
– Latency of memory availability
– Best fit when one partition is not busy
while another partition is busy
� AIX, IBM i, and Linux partitions
� Comparably complex to setup
� Latency until pooled memory available
to application
� N/A
� No CPU cycles required after memory
allocation done
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