Determining the available I/O entitled memory on the destination server

You can determine whether the shared memory pool on the destination server has enough available memory to accommodate the I/O entitled memory required by the mobile partition. You can then allocate more physical memory to the shared memory pool, if necessary, by using the Hardware Management Console (HMC).

1. Identify the amount of I/O entitled memory that the mobile partition requires:
   1. In the navigation pane, expand Systems Management > Servers.
   2. Click the source server on which the mobile partition is located.
   3. In the work pane, select the mobile partition.
   4. From the Tasks menu, click Properties. The Partition Properties window is displayed.
   5. Click the Hardware tab.
   6. Click the Memory tab.
   7. Click Memory Statistics. The Memory Statistics panel is displayed.
   8. Record the Assigned I/O Entitled Memory. This is the amount of I/O entitled memory that the mobile partition requires on the destination server.
2. Identify the amount of available physical memory in the shared memory pool on the destination server:
   1. In the navigation pane, expand Systems Management and click Servers.
   2. In the work pane, select the destination server to which you plan to migrate the mobile partition.
   3. From the Tasks menu, click Configuration > Virtual Resources > Shared Memory Pool Management.
   4. Record the Available pool memory and click OK.
3. Compare the amount of available memory (from step 2) with the amount of I/O entitled memory required by the mobile partition (from step 1).
   • If more memory is available than the amount of I/O entitled memory required by the mobile partition, the shared memory pool on the destination server has enough available memory to support the mobile partition on the destination server.
   • If the amount of I/O entitled memory required by the mobile partition is greater than the amount of available memory, perform one or more of the following tasks:
     • Add memory to the shared memory pool so that the shared memory pool has enough available memory to accommodate the I/O entitled memory required by the mobile partition. For instructions, see Changing the size of the shared memory pool.
     • Remove one or more shared memory partitions from the shared memory pool until the shared memory pool has enough available memory to accommodate the I/O entitled memory required by the mobile partition. You can remove a logical partition from the shared memory pool by changing the memory mode of the logical partition from shared to dedicated. For instructions, see Changing the memory mode of a logical partition.
     • Remove I/O adapters from the mobile partition so that it requires less memory for I/O operations. For instructions, see Removing virtual adapters dynamically.
   • If the amount of I/O entitled memory that is required by the mobile partition is equal to, or almost equal to, the amount of available memory, the shared memory pool is probably greatly overcommitted, which can affect performance. Consider adding more memory to the shared memory pool to reduce the degree to which the shared memory pool is overcommitted.