DLPAR guidelines for adding microprocessors or memory

There are several ways of determining when a memory or processor shortage is occurring or when I/O slots must be added.

When you remove memory from a partition, the DR operation succeeds even if there is not enough free physical memory available to absorb outgoing memory, provided there is enough paging space available instead of physical memory. Therefore it is important to monitor the paging statistics of the partition before and after a DR memory removal. The virtual memory manager is equipped to handle paging, however, excessive paging can lead to performance degradations.

You can use the guidelines available in Memory performance and Microprocessor performance to determine when a memory or processor shortage is occurring. You can use the guidelines available in Network performance to determine when I/O slots must be added. These guidelines can also be used to estimate the impact of reducing one of these resources.