Controller overview

Each controller canister contains a controller card, a battery, and an optional host interface card (HIC).

Replace controller

When you replace a failed 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.

You can determine if you have a failed controller canister in two ways:

Attention LED

Note: The figure shows an example controller canister; the host ports on your controller canister might be different.