Redundant server components provide some guarantee against total system failure in case one or more subsystems fail. Hot-swap SCSI hard drives can be replaced without powering down the entire system. Hot-plug PCI accessories can likewise be swapped out. Redundant hot-swap NICs make it possible to balance the network traffic load between cards, and if one of them fails another takes over the load. Servers with an optional redundant RAID controller reduce the chances of data loss from a single point of failure.
Servers come in rackmount or tower configurations.
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