Final answer:
The primary consideration in the engineer's design for a data center that provides services around-the-clock and resolves disruptions quickly is reliability.
Step-by-step explanation:
One of the primary considerations for a systems engineer designing a data center that provides services around-the-clock and must resolve disruptions quickly is reliability. Reliability refers to the ability of a system to function consistently and predictably. In the context of a data center, this means ensuring that the infrastructure is robust and resilient, with backup systems and redundancy in place to minimize downtime.
Scalability is also an important consideration as it allows the data center to handle increasing demands and expand as needed without compromising performance. Cost-effectiveness and energy efficiency are important factors to consider as well, but in the context of a 24/7 data center with quick resolution of disruptions, reliability takes precedence.