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180 IBM BladeCenter JS23 and JS43 Implementation Guide
򐂰 Virtual Input/Output Server 2.1.1
򐂰 Only virtual I/O, no physical adapters or logical ports from an HEA allowed
򐂰 Only shared processor mode, no dedicated processors
򐂰 AIX 6.1 TL3
򐂰 IBM i 6.1 plus latest cumulative PTF package + SI32798
򐂰 SUSE Linux Enterprise Server 11
5.1.2 Workload
In the Active Memory Sharing environment there are three types of shared
memory scenarios:
򐂰 Physical over-commit
򐂰 Logical over-commit
򐂰 Non over-commit
Physical over-commit occurs when the combined working set of memory, of all
the shared memory partitions, is greater than the total physical memory in the
shared memory pool. In this case the actively used logical memory of the shared
memory is backed by physical memory and the paging devices.
Logical over-commit occurs when actively referenced memory pages by the
partitions are backed by physical memory allocated from the Active Memory
Sharing Shared Memory Pool. Logical memory that is not actively referenced
and that exceeds the amount of physical memory will reside on the paging
device.
Non-overcommit occurs when the backing physical memory in the shared
memory pool is adequate to cover all the peak needs of the shared memory
partitions.
The potential workload candidates for Active Memory Sharing should be
monitored for a period of time using a dedicated memory partition to understand
the size and range requirements of memory usage.
Physical over-commit would be suitable for workloads such as file and print
servers and network applications that are not highly sensitive to I/O latency.
Shared memory partitions in this model will require paging of active memory
pages.
Logical over-commit scenarios would work best with partition workloads that
have peak usage at different times of the day causing utilization peaks and
valleys to overlap. Other examples that would be prime candidates are test and
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