Moving Datacentre – next two weeks

There have been a couple of postings about moving our servers into a new datacentre (Green ICT, How to Move 160 Servers). Well, now the time has come! As a reminder, we plan to move all of our servers out of the Faculty of Health and Social Care Server room into a refurbished datacentre shared with the University of Aberdeen and Aberdeen College. Over the past few months IT Services staff have been preparing the ground, making sure that the network connections are all working and that the services being moved are ready. Some of this work is highly specialised – one of the essential components to link the network had not been properly configured and had to be returned to Japan for further work, a round trip of 3 weeks. IT Services did also find that the configuration of some services had to be changed to allow them to operate in the new datacentre, and you will have seen a few small outages to allow these services to be updated.

The moves are going to happen over the next 2 weeks. ITS are not moving everything in one go, but will carry out the move in 2 or 3 stages. Some of the services ITS will be able to move without any downtime at all, some will require some downtime which is unavoidable.

The first batch are going to move this week, but the main move is planned to be the weekend of 27th July. That weekend in particular will be a substantial move and there is likely to be some downtime over the weekend, so do keep an eye on the information notices which will be issued and plan your work and studies around this.

Once this is complete, we will have removed a significant risk from our IT infrastructure by being able to decommission the old server room (see When Things Get Hot). We will also greatly improve our environmental credentials. One key measure for datacentres is “Power Usage Effectiveness”, or PUE. This is a measure of the total amount of power used by the datacentre, divided by the raw power used just by the servers – and the reason this figure is important is that older datacentres use a lot of extra power just to keep the servers cool. So, for example, if you have servers consuming 100kW of power, and if you need another 100kW of air conditioning to keep them cool, then the datacentre is using 200kW of power in total. The PUE is 200/100 = 2. We want a figure which is as close to 1 as possible – the lower the better.

In the shared datacentre we’re aiming for an average PUE of 1.2 or less, and have already reached figures as low as 1.08 at times which means we are using much less additional power to cool the servers. That sort of figure is close to Facebook’s big new datacentre in Sweden  and we anticipate we will reduce our carbon output by around 230,000 Kg per annum.

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