Posted on November 18, 2022 by Gento
Data center operators are suffering fewer data center outages, but the financial impact is increasing when they do happen.
In 2021, 69% of data center operators reported that they experienced an outage during the past three years, down from 78% in 2020, according to a recent Uptime Institute survey of 786 global IT and data center managers.
Posted on April 27, 2021 by Gento
This blog from Raritan answers the question, where best to mount environmental monitoring sensors in the rack? From airflow to temperature, we address the highs and lows of sensor placement.
Posted on March 8, 2021 by Gento
The COVID-19 pandemic has demonstrated the data center industry’s reliance on remote management. In this blog, we discuss the role of Raritan SmartSensors while looking back a year.
Posted on March 2, 2021 by Website Administrator
For the past year, the European Union (EU) has threatened to enact green data center laws including a goal of requiring data centers in Europe to be climate neutral by 2030. But in hopes of preempting government regulations, a group of European data center operators have signed a pact to self-regulate themselves.
Posted on March 28, 2017 by Gento
Why do we load balance?
Without going into the complicated math, suffice it to say that load balancing in a 3 phase system is desirable. The more unbalanced a system the more problems it creates. UPS life, for one, can be affected by unbalanced systems. Although one circuit (server cabinet) being out of balance won’t have much effect, if many or all circuits on a panel are out of balance, the main circuit supplying the breaker panel will be out of balance and this can ruin your upstream UPS. There are also efficiency issues with unbalanced loads.
How is load balancing currently accomplished in a rack cabinet?
To balance a load in a cabinet, the loads of the equipment power supplies are spread across the 3 phases – L1/L2, L2/L3, L3/L1. This is done by plugging the first server (or switch/router) in an outlet wired on L1/L2, the next server on L2/L3, the next on L3/L1, then start over. The goal is to get an equal number of devices/loads on all 3 phases – or as close as possible.
This approach can quickly turn into a cabling nightmare. Most rack PDUs are linear in their phase layout of outlets – there are only three banks of outlets, one for each phase. For example, on a 36 outlet PDU, outlets 1 through 12 will be on L1/L2, 13 through 24 on L2/L3, and 25 through 36 on L3/L1. If you use the above method of balancing, and start racking the devices at the bottom U position, the third device you plug in will need to reach the top third of the PDU and the last device may have to reach back to the bottom of the PDU. In other words, a lot of crisscrossed cabling.
How do Raritan’s balance the cable and load balancing challenge?
In certain Raritan PX three-phase models the architecture gets around the cabling issue by staggering the grouping of outlets - there are at least 6 banks of outlets. For example, outlets 1 through 6 are on L1/L2, 7 through 12 on L2/L3, 13 through 18 on L3/L1, but then we start over at L1/L2 for outlets 19 through 24. (See Illustration below)
This intelligently engineered architecture results in more reliability and easier execution. The devices towards the top of the cabinet don’t need to be plugged in to the bottom of the PDU and devices at the bottom don’t need to be plugged in to the top.