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The SDMC or IVM is used to configure, validate, and orchestrate Live Partition Mobility on
POWER-based blades. Use the SDMC to enable mover service function for Virtual I/O
Server; an SDMC or IVM wizard validates your configuration and identifies issues that will
cause the migration to fail. During the migration, the SDMC or IVM controls all phases of the
process.
3.4.7 Active Memory Sharing
Active Memory Sharing is an IBM PowerVM advanced memory virtualization technology that
provides system memory virtualization capabilities to IBM Power Systems, allowing multiple
partitions to share a common pool of physical memory. Active Memory Sharing is only
available with PowerVM Enterprise edition.
The physical memory of an IBM POWER6 or POWER7 system can be assigned to multiple
partitions in either a dedicated or a shared mode. The system administrator has the capability
to assign physical memory to a partition and physical memory to a pool that is shared by
other partitions. A single partition can have either dedicated or shared memory.
In a dedicated memory model, the system administrator's task is to optimize available
memory distribution among partitions. When a partition has performance degradation due to
memory constraints and other partitions have unused memory, the administrator can allocate
memory by doing a DLPAR operation.
With a shared memory model, it is the system (PowerVM Hypervisor) that automatically
decides the optimal distribution of the physical memory to partitions and adjusts the memory
assignment based on partition load.
Active Memory Sharing can be exploited to increase memory use on the system either by
decreasing the system memory requirement or by allowing the creation of additional
partitions on an existing system. Active Memory Sharing can be used in parallel with Active
Memory Expansion on a system running a mixed workload of several operating systems. For
example, AIX partitions can take advantage of Active Memory Expansion while other
operating systems take advantage of Active Memory Sharing.
For additional information regarding Active Memory Sharing see PowerVM Virtualization
Active Memory Sharing, REDP-4470, available from:
http://www.redbooks.ibm.com/abstracts/redp4470.html
Figure 3-13 on page 115 shows each logical partition can be configured to have shared
memory using Active Memory Sharing or dedicated memory.
114
IBM BladeCenter PS703 and PS704 Technical Overview and Introduction
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