You install a host interface card (HIC) to replace the failed one with a new HIC.
About this task
Attention: Possible loss of data access – Never install a HIC in an E2800 controller canister if that HIC was designed for another E-Series controller. In addition, if you have a duplex configuration, both controllers and both HICs must be identical. The presence of incompatible or mismatched HICs will cause the controllers to lock down when you apply power.