• Recent Posts

  • Categories

  • Tags

  • March 2023
    M T W T F S S
  • Recent Comments

  • Archives

  • Meta

Archive for the ‘Energy efficiency’ Category

Measuring SU data centre Power Usage Effectiveness (PUE)

Tuesday, December 23rd, 2008

The Green Grid recommends the Power Usage Effectiveness (PUE) metric for data centres in order to benchmark and compare energy consumption between data centres and to baseline consumption against which improvements in energy efficiency may be measured.

PUE is defined as:

Total Facility Power
IT Equipment Power

Most data centres operate at PUE = 2 to 3 and some at PUE > 3. PUE = 3 means that for every watt consumed by the computers, 2 watts are being consumed by data centre (or computer room) air-conditioning (CRAC), lighting and power delivery equipment. The goal is thus to get PUE to approach 1. Google, operator of the world’s largest data centres, reports that current state-of-the-art data centres can attain a PUE of 1.2. (more…)

Microsoft server power management

Thursday, December 18th, 2008

Microsoft has just published an excellent paper for server system administrators entitled Power in, dollars out: How to stem the flow in the data center. It gives a succinct overview of power management considerations on Windows servers and explains how energy-efficient data centres can be implemented.

PCs and aircons

Thursday, December 18th, 2008

Many people don’t realize that the average desktop PC wastes nearly half the power it draws from the wall socket. This excess energy is dissipated as heat. The average server wastes 30 to 40 percent of its power.

From an address by Dr. Dileep Bhandarkar, Distinguished Engineer, Microsoft at 2008 CeBIT

The advent of PCs in offices also partially explains the explosion in installations of air-conditioning units in (more…)

Shutting down computer labs to save electricity

Thursday, November 27th, 2008

The computer lab in the Faculty of Science, NARGA, has 4 classrooms and 2 open areas containing a total of 310 computers. Of the 6 rooms, 4 are available 24 hours a day. Obviously not all the computers are in use all of the time. We have implemented an auto-shutdown policy that applies in the event that a computer becomes idle after hours. This policy has been active since the beginning of 2008. (more…)

Activate PC power management to save energy

Wednesday, November 26th, 2008

Most newish PCs and all notebooks/laptops have Power Management settings that enable you to minimise the machine’s power consumption, especially for the times when you are not using it. It is possible to save 10% of its power requirement per day through implementing these simple settings which progressively switch off components such as the screen, hard drives, processor, etc. Information Technology has created a help document (pdf) to guide you through setting power management on your PC for Windows XP and Vista. If you would rather want a technician to talk you through the procedure, contact the IT Helpline at (021-808)4367 or ithelp at sun.ac.za.

And of course it should be standard practice to switch off the PC (at the wall socket) when you leave work and over weekends. Also note that screensavers use electricity unnecessarily; rather set your screen to switch off.

Bespaar krag deur die bestuur van werkstasies

Wednesday, November 26th, 2008

IT is besig om ‘n ondersoek te doen, oor hoe krag bespaar kan word, deur die bestuur van werkstasies. Daar word gekyk na die afskakel van werkstasies wanneer dit nie gebruik word nie, asook die afskakel van monitors indien die werkstasie nie gebruik word nie. (more…)