E-Tech ET8 Specifikace stáhnout pdf (Strana 213)

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Chapter 5. Active Memory Sharing configuration using IVM 179

5.1 Planning considerations

Active Memory Sharing is an IBM PowerVM advanced memory virtualization

technology that provides system memory virtualization capabilities to IBM Power

Systems, allowing multiple logical partitions to share a common pool of physical

memory.

When using a shared memory mode, it is the system that automatically decides

the optimal distribution of the physical memory to logical partitions and adjusts

the memory assignment based on demand for memory pages. The administrator

just reserves physical memory for the shared memory pool and assigns logical

partitions to the pool."

"The PowerVM™ Active Memory™ Sharing technology (or shared memory)

allows logical partitions to share the memory in the shared memory pool. Instead

of assigning a dedicated amount of physical memory to each logical partition that

uses shared memory (hereafter referred to as shared memory partitions), the

hypervisor constantly provisions the physical memory from the shared memory

pool to the shared memory partitions as needed. The hypervisor allows shared

memory partitions that need memory to use portions of the shared memory pool

that are not currently being used by other shared memory partitions. When a

shared memory partition needs more memory than the current amount of unused

memory in the shared memory pool, the hypervisor stores a portion of the

memory that belongs to the shared memory partition in auxiliary storage. Access

to the auxiliary storage is provided by a Virtual I/O Server logical partition. When

the operating system attempts to access data that is located in the auxiliary

storage, the hypervisor directs a Virtual I/O Server to retrieve the data from the

auxiliary storage and write it to the shared memory pool so that the operating

system can access the data. The PowerVM Active Memory Sharing technology is

available with the PowerVM Enterprise Edition hardware feature, which also

includes the license for the Virtual I/O Server software.

Successful implementation of Active Memory Sharing requires a thorough

understanding of the workloads that will be placed on memory sharing partitions.

Workloads that have a high sustained memory needs because of sustained peak

loads or High Performance Computing applications would not be good

candidates for Active Memory Sharing.

5.1.1 Prerequisites

To use Active Memory Sharing on a IBM BladeCenter JS23 or JS43 minimum

software, configuration and feature levels must be met. These are:

򐂰 IBM PowerVM Enterprise Edition

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