Metering the Data Centre

PUE, DCiE, what’s it all about? PUE is a metric developed by The Green Grid to measure Power Usage Effectiveness (PUE); DCiE (Data Centre infrastructure Efficiency) is simply the inverse of PUE reported as a percentage. OK, so now we are in recession. There are, and will be more, calls for spending cuts and more efficiency from existing hardware and our staff. PUE and DCiE can play an important part in this.

But where to start? As we are talking data centres, look at the power consumption. Or more accurately, look to see if you can look at the power consumption. It is amazing how many data centres and computer rooms, even the new builds don’t have metering installed to monitor power consumption. Data centres are estimated to contribute 3% of the CO2 emissions globally, yet the vast majority of data centre managers have no idea how much energy their facility consumes – let alone where to start making savings.

How do you get on with your company’s Facilities Manager? Ok, putting that aside, it’s imperative that there is a good working relationship between these vastly important departments (IT and Facilities) as these two hold the key to reducing energy consumption, and therefore costs, more than any other department.

Look at it from the Facility’s Managers point of view. He has little if any impact on what is installed in the data centre. All he or she will see is the monthly or quarterly electricity bills coming in with little idea of where to reduce costs, or indeed, where the costs are coming from. Keeping him/her in the picture is incredibly important.

With metering installed a whole range of other opportunities for savings is opened up. Chargeback for example. Facilities charge IT for power used, IT charge the business, whether on an application basic or per U basis. The method can be agreed, the important thing is that metering opens the doors to making the whole business aware of the true cost of powering the data centre. Metering at the rack or server level isn’t necessarily needed. That’s an additional expense and an overhead to monitor. Although it would be great, keep it simple to start.

Working together to install electricity meters to enable the PUE and DCiE to be calculated and logged on a regular basis is a start. It is also imperative to log your consumption regularly by taking meter readings and trending the power usage, what impacts it and what changes it.

How much will you save by installing these meters? Without proper metering, who knows?

Migration Solutions is a specialist computer room and data centre specialist offering independent advice on the design, build and operation of data centres and computer rooms. See our website at www.migrationsolutions.com, or email us at info@migrationsolutions.com.

Facilities Manager - Friend or Foe?

In the computer rooms and data centres that we visit there is invariably friction, to say to the least, between the IT department and the Facilities department. IT don’t want to allow access to ‘their’ computer rooms, and facilities need access to maintain the plant.

These frictions need to be overcome. Facilities do need access to the computer room, and this should be allowed in a controlled manner, and if necessary, accompanied by a member of the IT team. Don’t forget however, that access could be required 24/7.

Ideally the computer room or data centre should be built with Facilities in mind. Putting the chillers in corridors outside of the room means that they can be worked on without the need for anyone to access the secure rooms. The environmental monitoring system should be linked to the in-house BMS – usually within the Facilities team’s domain. There is no reason however, why access shouldn’t be given to the data collected by it or to be on the list of people to be paged, emailed and/or sent a text message in the event of an alarm. Indeed, this can be beneficial to everyone as the IT Ops team are often required to work 24 hour shifts.

As I will be discussing tomorrow, metering should be installed in any computer room to allow for the calculation of PUE and DCiE, and to allow for ‘charge back’ to encourage everyone within the business to reduce energy costs. Facilities charge IT for the energy used, IT charge their customers in some way - whether by application, U space, or some other metric.

Building strong working relationships between these business critical teams is imperative. With modern IT infrastructure, cooling and power requirements, IT and facilities will have to work closer together. Migration Solutions specialises in designing data centres and computer rooms for operation. We understand how to operate a well run facility.

For more information see our website at www.migrationsolutions.com or email us at info@migrationsolutions.com