You can replace a power supply unit (PSU) as a hot-swappable server component. The server can operate on a single PSU if necessary, making it possible to replace a failed PSU without shutting down the server. If a PSU fails, it must be replaced as quickly as possible because operating on a single PSU means that there is no redundancy in that area, increasing the risk of an interruption in service to clients.
LED indicators on each PSU indicate the PSU status.
Note: Refer to the section on Power supply units for more information.