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Chapter 5. Active Memory Sharing configuration using IVM 181
development environments and workloads that do not have sustained load
requirements.
5.1.3 Paging devices
Active Memory Sharing paging devices and operating systems paging device
considerations are similar. Active Memory Sharing paging operations will be
typically be 4k in size. Write and read caches should be enabled. Striped disk
configurations should be used when possible with a 4k stripe size.
The sizes of the dedicated paging devices for AIX and Linux shared memory
partitions must at least equal the maximum amount of logical memory assigned.
IBM i shared memory partitions must have paging devices that are at least the
size of the maximum logical memory assigned multiplied by 1.008.
5.1.4 Collaborative Memory Manager
Collaborative Memory Manager (CMM) running in the operating system of the
shared memory partitions coordinates with the hypervisor to provide hints on
logical page usage. These hints of the status of memory pages will help the
hypervisor prioritize pages.
CMM is configured from the OS running in the shared memory partition. When
the CMM loan policy is enabled, the OS loans pages to the hypervisor to help
reduce hypervisor paging required to support the overcommitment of memory..
When CMM policy is disabled the hypervisor will do the paging based on hints
from the OS.
5.1.5 CPU resource sizing
This section looks at VIO Server and shared memory partition additional CPU
entitlements required in an Active Memory Sharing environment.
Virtual I/O Server
Additional CPU resources will be required for the VIO Server to properly service
the Active Memory Sharing environment. The hypervisor is does the address
translation and allocation of physical memory across partitions and the VIOS
donates cycles to the hypervisor for these operations and also needs cycles for
the paging activity.
The additional VIO Server CPU requirements per shared memory partition can
typically range from 0.005 for light paging rates using internal storage to 0.16 for
heavy paging rates using high end SAN storage as shown in Table 5-1.
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