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Power supplies fail rarely. A failure often is the result of a problem with a breaker or a loose power cable. 

Each RPC supplies power to the disk enclosures, management switch, and hosts. Replacing an RPC or PDU requires a two-hour system outage. 

## Failure cheat sheet 

The types of failures and their effect on the system are listed in Table 1. 

<img src='content_image/1011247.jpg'>

