Tesco virtualisation cuts carbon and costs

Tesco has applied the latest blade server and virtualisation technology to mission-critical systems running in its data centre to improve performance, cut costs and help fulfil its commitment to reduce its carbon emissions.

The UK supermarket giant late yesterday announced updates to its Real Time Sales (RTS) systems, virtualising key business applications with Citrix XenServer, running on HP ProLiant BL680c G5 blade servers.

The updates and new IT infrastructure have increased the capacity of Tesco's RTS systems by 75 per cent, to handle 1,500 sales-related messages per second. The work also represents a milestone in the retailer's plans to virtualise its entire server infrastructure.

And the project has helped the company hit its target of reducing carbon emissions from its UK data centres by 20 per cent.

Tesco needed to handle its growing capacity demands, and looked at virtualisation as a more cost and carbon efficient option than just buying more physical servers. But, as the same time, it needed to ensure the new infrastructure could also improve performance.

Nick Folkes, UK IT director at Tesco, explained: "After conducting a major evaluation of virtualisation providers, we went with Citrix based on the strength of the Xen technology, the ability XenServer has to provide high levels of performance for heavy duty 64-bit applications, its licensing model and its UK-based engineering team decisions that have already paid off for us."

He said the virtualised RTS environment uses less than half of the energy of the physical bare metal equivalents, which supports Tesco's carbon emission targets and has already saved a significant amount on electricity bills. While Citrix advanced virtualisation management licences are charged per server, instead of per socket, so Tesco is not penalised for using larger blade servers.

"We're running far more efficiently and the ongoing management of the environment is much simpler," added Folkes. "While our primary goal in working with Citrix and HP was to create a more flexible IT infrastructure, the consolidation benefits are significant."

Tesco is continuing to deploy XenServer for its major server consolidation project, aiming for a conservative 10:1 consolidation ratio for physical to virtual servers and is hitting 70 per cent CPU utilisation on the servers, versus the previous six per cent.