Replacing a disk drive and a service controller: 2145-CG8 or 2145-CF8

You can replace a service controller at the same time that you replace the disk drive on a SAN Volume Controller 2145-CG8 or 2145-CF8. However, you might not be able to complete a node rescue because the nonvolatile memory in the "new" service controller does not contain the operating system software required to do so.

Also, if you must replace the hard disk and the service controller at the same time, you cannot boot the node to complete node rescue. If you find that you cannot run node rescue, then use the following procedure to complete the rescue:

Swap the service controller with a service controller from a working node. The results are the following:
- The "new" service controller that is swapped into the working node has its nonvolatile memory updated when the node is booted from the hard disk.
- The service controller that is swapped into the failed node from the working node contains the operating system that is required to complete node rescue on that failed node.
When all updates are complete, swap the service controllers again, returning them to their original nodes.