For the purposes of DR, there are two types of memory to consider. These two types differ only in usage. The actual hardware is the same for both types.
The memory used by the operating system is called the kernel memory cage. Sun Cluster software does not support remove-board operations on a board that contains the kernel memory cage and will reject any such operation. When a DR remove-board operation pertains to memory other than the kernel memory cage, Sun Cluster will not reject the operation.
When a DR add-board operation that pertains to memory succeeds, memory on the added board is automatically incorporated in system operation.