“…Redundancy built in the electric supply of the datacenter is essential for ensuring that such high numbers are reachable, but costs are also necessarily impacted due to over-sizing [103]. As stated in [104], redundancy is necessary to achieve high availability, but it also improves the maintainability, flexibility, expandability and fault management of datacenters. For example, turning off an UPS or a rack in case of maintenance or a fault, servers can remain powered using redundant feeds.…”