DR Clustering Considerations for Memory

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 affects memory other than the kernel memory cage, the DR subsystem allows the operation and automatically makes the node stop using that memory.

When a DR add-board operation affects memory, the DR subsystem automatically makes the node start using the new memory.