text: Figure 13-7 Expansion enclosure power supply unit 
  
  Power supplies in both control and expansion enclosures are hot-swappable and replaceable 
  without a need to shut down a node or cluster. If the power is interrupted in one node for less 
  than 5 seconds, the canister does not perform a fire hose dump, and continues operation 
  from the battery. This feature is useful for a case of, for example, maintenance of UPS 
  systems in the data center or replugging the power to a different power source or PDU unit. A 
  fully charged battery can perform two fire hose dumps. 