What key advantage do rack servers offer in a data center?

Rack servers provide high density and efficient resource utilization, making them a preferred choice in data centers. This design allows multiple servers to be housed in a single rack, which maximizes the use of physical space. By stacking servers vertically, a data center can house more computing power within a limited footprint, leading to improved organization and reduced physical clutter.

Moreover, rack servers often share resources such as power and cooling, which increases efficiency. This centralized approach to resource management lower operational costs and simplifies maintenance. The layout of rack servers also facilitates better airflow and cooling, which is critical for the performance and longevity of the servers.

In contrast, the options regarding easy portability and complete isolation do not capture the inherent benefits of rack servers, which are designed for scalability and efficiency rather than mobility. While increased cooling systems may be important for server operation, the fundamental advantage of rack servers lies in their ability to provide optimized resource utilization within a compact space.