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Chapter 5. Active Memory Sharing configuration using IVM 183

򐂰 Assigning a memory weight. The IVM UI allows three values, low, medium

and high, with a default of medium.

򐂰 Paging device configuration, the higher the subscription ratio the higher the

need for optimized paging devices.

򐂰 CMM configuration determines page loaning policy. Application load and

loaning policy, none to aggressive, should be evaluated for acceptable

performance. CMM is set at the OS level therefore a mix of loaning levels can

exist in the same system.

򐂰 Rebalance resources to improve overall system utilization. Previous memory

limits that caused under utilization of CPU and memory resources can be

reviewed for new allocations or additional workloads.

5.2 Configuration of Active Memory Sharing using IVM

IVM is used to configure the main components of Active Memory Sharing, the

shared memory pool and the paging storage devices used by the hypervisor.

Once Active Memory Sharing is configured IVM is used to create new, or change

existing LPARS to utilize shared memory

5.2.1 Defining the shared memory pool and paging storage pool

When creating the shared memory pool for Active Memory Sharing you also

create the paging storage pool in the same step. The shared memory pool

cannot exceed the current memory available minus the amount required for

Reserved Firmware Memory.

There are two possibilities for the paging space that is managed by the

hypervisor. The first is to created a common paging storage pool and this step is

required. The second is to create individual paging devices for each LPAR using

shared memory and is covered in 5.2.2, “Creating dedicated paging devices for

partitions” on page 191

Note: Reserved Firmware Memory requirements increase when the Active

Memory Sharing shared memory pool is created. Also as additional partitions

are created and additional virtual resources are defined the Reserved

Firmware Memory value will increase. If the Active Memory Sharing shared

memory pool is defined close to the maximum amount you limit the ability to

create additional resources.

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