F E A T U R E
What are the key power and sensor metrics data centre operators must monitor now, and how have these metrics evolved?
In the current market, servers can cost close to $ 1 million each. At such a high cost, it is imperative that you also have high uptime and efficiency. To ensure this, we have moved from measuring only your key standard metrics – power drawn per outlet, power drawn per inlet, circuit breaker status, and overall metering – to now monitoring advanced metrics.
In the latest generation of Raritan PDUs, we offer advanced power metering, circuit breaker forensics, and harmonic distortion monitoring, among many other features. These metrics are vital for maintaining rack efficiency and maintaining uptime in high-density environments. For hyperscalers, it’ s crucial to monitor all necessary parameters 24 / 7 to make informed decisions and prevent costly downtime.
Beyond capacity, what is the single greatest physical constraint that high-density AI power demands are placing on your PDU design?
GPU servers now occupy 4U, 6U, or even 8U, leaving very limited space available within the rack to deploy PDUs. At these densities, everything becomes a constraint – the manifolds, cable management, and the airflow. There is effectively no standard rack that meets hyperscalers’ requirements, so many operators are seeking custom rack designs tailored to their needs.
Airflow and cable management have also become top priorities. GPU servers generate an enormous amount of heat, requiring a complete rethink of the entire rack setup. It’ s not just capacity anymore; the overall rack design is becoming much more challenging with the way these servers are being built.
As power loads increase, what are the critical considerations for overcurrent protection and selective coordination that must be addressed at the rack level to prevent widespread outages?
This is one of the most important areas of focus for us at Raritan. Previously, the priority was on rack capacity, and we built our PDUs accordingly, but capacity is no longer the biggest constraint. Today, the focus is on outlet-level protection regarding power consumption.
With power supplies reaching highs of 6.6kW, current draw has increased significantly. Additionally, traditional breakers are typically capped at 16 amps, so any power drawn over 16 amps will
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