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In order to protect against the loss of a server, which items should be redundant or have fail over capability?
Power supplies, CPU's, memory modules
Memory modules, Fans, Disk Drives
Network ports, Fans, power supplies
Disk drives, network cards, power supplies
Disk drives, memory modules, power supplies
Disk drives, network cards and power supplies should all be made resilient through the use of multiple devices. For drives this could be mirroring or attachment to external arrays, For network cards, trunked interfaces or fail over adaptors. For power supplies, there should be enough power supplies to run the host if their is a failure of 1. All other components such as memory modules do not strictly require additional components to cover off for failures. It might be argued that fans do, but systems are usually overfanned, so the loss of a single fan will not cause a failure.
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