A controller consists of a board, firmware, and software.
It controls the drives and implements the System Manager function. This section describes how to replace
a controller in a controller shelf with two-controller configuration.
Overview and requirements
Before you replace a controller you need to be aware of certain requirements and considerations.
Replace a controller
The following replacement procedure is based on the scenario that your storage array is a two-controller configuration. Each controller canister contains a controller card, a battery, and an optional host interface card (HIC). When you replace a controller canister, you must remove the battery and HIC, if one is installed, from the original controller canister, and install them in the replacement controller canister.