External Redundancy for Data Center

B.

Generators are considered an external redundancy to a data center.

Power distribution units (PDUs), storage systems, and power feeds to racks are all internal to a data center, and as such they are considered internal redundancies.

External redundancy refers to the backup systems and infrastructure that are outside of the main data center facility. The purpose of external redundancy is to ensure that there is always a backup in place in case the main facility experiences an outage or failure.

Among the options listed, power feeds to the rack, generators, and power distribution units (PDUs) are all examples of external redundancy. These systems provide backup power to the data center in case of a power outage.

Power feeds to the rack refer to the power cables that connect the servers and other equipment to the power source. Generators are backup power sources that can provide electricity to the data center in case the main power source fails. PDUs distribute power to the equipment within the data center and can be configured to provide redundant power feeds to each piece of equipment.

Storage systems, on the other hand, are not considered external redundancy for a data center. Storage systems are responsible for storing and retrieving data, but they do not provide backup power or other infrastructure to the data center.

In summary, among the options listed, power feeds to the rack, generators, and power distribution units are examples of external redundancy for a data center, while storage systems are not.