Car rental firm Hertz International is in the final three months of an ambitious desktop virtualisation project using VMware covering 4000 PCs across its European operations.
The project will cut support costs, simplify IT management and lower the company’s energy bill, says Paul Bermingham, vice president, global infrastructure services at Hertz International.

At Hertz, every operator has a PC, which is used to access a number of systems ranging from applications that run at the counter where a customer collects a car, to back office PCs to support Hertz car rental network across Europe.
Having already virtualised its servers on VMware, Bermingham says the company began discussing its desktop IT strategy with Cisco, Microsoft and VMware.
“We started talking to Cisco, Microsoft and VMware. We run an innovation centre in Dublin and looked at a proof of concept within the IT team.

If the IT team can use a virtual desktop, then anyone can.” This is because IT tends to have power users who can test the limits of desktop virtualisation.

The pilot involved virtualising the customer service centre in Dublin with 875 PCs over a LAN connection.

This was then expanded to test in remote locations across a WAN to identify remote acess problem areas. From the pilot Bermingham found that desktop virtualisation used less energy than desktop PCs. “We have seen a 10% reduction in energy reduction in Dublin,” he adds.
For the full deployment, Bermingham said that Hertz has signed a single telecommunications contract with service level agreements based on the size location the network connection needs to support.Along with upgrading bandwith to all networks, the rollout has also involved upgrading its Cisco network.
Hertz has used Wyse thin client terminals to provide operators with access to Windows.

These connect to a Windows server farm in Dublin via an MPLS network.
The company effectively runs its own private cloud, which is much more supportable that using desktop PCs.

For instance, Bermingham says hardware parts can be sent to the field office if IT equipment fails. “With Wyse terminals there is no desktop PC support.

This is a huge benefit as  our old estate of PCs needed to be replaced.”
So rather than use field support Hertz is able to have a contract with local firms to fix equipment.

There is also the IT management benefits.

He says: “We don’t have to patch PCs. Instead we can patch servers. So there is less support.”
Like many organisations, Hertz has legacy PCs running Windows XP.

He says: “A lot of people were on XP, but as we rollout we will go to latest version of Windows and [Microsoft] software.”
Centralised IT management means patching that used to take a week now runs overnight, he said.
Boot storms
One of the documented issues with desktop virtualisation is that if everyone logs in at the same time, the system can come to halt trying to authenticate users.
Berminham says Hertz worked closely with its key IT suppliers to overcome the technical challenges. “All our capacity has been built to support boot storms. We worked with IBM, Cisco, VMware, and we had access to their US people.”
To solve the boot storm bottleneck problem, he says IBM built a SAN with offsite disaster recovery. Using this DR site means Hertz has the capacity to distribute its user logins across two sites.
IT drives business 
Given that desktop virtualisation means that storage is centralised, Bermingham says: “We don’t have PCI [Payment Card Industry] issues because you cannot save [credit card] information and [customers’] personal data because all documents are stored on the server.””
Hertz has used the desktop virtualisation project as part of a project looking at how to run IT efficiently across the locations it operates.

Along with providing efficient connectivity to the central IT systems for car books, Hertz has also switched to low cost printers and is now working on unified communications. Bermingham adds: “The benefit to our customers is that the speed of service increases dramatically.” He says Hertz is looking at ways to use VoIP and video to enhancing the customer experience through IT and digital technologies.
According to Bermingham, this changes the role of an IT manager. “We can change IT from tech engineers, to business managers.”
The desktop virtualisation rollout is due to be completed across Europe by the end 2013.

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