A blade server chassis has two power supplies. What is a benefit of connecting each power supply to a separate UPS unit?

Connecting each power supply of a blade server chassis to a separate uninterruptible power supply (UPS) unit enhances fault tolerance. This setup ensures that if one UPS fails or experiences an issue, the other UPS can still provide power to the server chassis. Thus, the server maintains continuity of operation even in the event of a failure in one of the power sources.

Having redundant power sources is a critical design consideration for servers, as it minimizes downtime and increases reliability in a data center environment. This redundancy helps protect against power interruptions and allows systems to continue functioning without disruption, which is particularly important in environments where uptime is crucial.

The other choices relate to different concepts. Quality of service is linked to managing bandwidth and prioritizing certain types of data traffic, traffic shaping is about controlling the flow of data packets to optimize network performance, and load balancing refers to distributing workloads across multiple resources to ensure no single resource is overwhelmed. While these are all important in their respective contexts, they do not directly impact the reliability provided by connecting power supplies to separate UPS units.