KT Corporation, based in Seongnam, South Korea, sought to expand its telecommunication services to include cloud-based services. First, KT offered cloud services to corporate customers. Then it wanted to expand to individual broadband and mobile
services subscribers. To achieve this, KT is using Windows Server 2012 and Hyper-V virtualization technologies to take advantage of Remote Desktop Services. It is using the session virtualization scenario and deploying Remote Desktop Session Host servers to
offer Microsoft Office 2013 to subscribers to access remotely. By using the centralized management console built into Windows Server 2012, IT staff expects to reduce the time to install session-based desktops. KT Corporation also expects to reduce hardware
and network costs while launching a new service that boosts its competitive advantage in the cloud-services market.
KT Corporation was established in 1981 when it split from the Ministry of Communications in Korea to develop advanced telephony services. When KT became a privately owned company in 2002, it began building a broadband network and increased its asymmetric
digital subscriber line (ADSL) customers to 6 million in just three years. KT also provides converged communications solutions, including Internet protocol television, voice over IP, and personal mobile Internet services under the WiBro brand.
KT began offering cloud services with its N-screen storage service, whereby individual customers can back up their data and access it from anywhere on a PC, portable computer, tablet PC, and smartphone. Services designed for corporate customers are available
under the uCloud brand, which gained more than 1 million subscriptions in the year following its release in 2010. With 15 petabytes of data in 5.5 billion files stored in servers at the Cheonan Cloud Data Center, uCloud is the biggest cloud service provided
by KT to date.
||With our Windows Server 2012 session virtualization solution, we can offer an easily managed, cost-effective service that delivers applications to subscribers. It’s a whole new business for us.
| Young-Jin An
Manager, Software Business Development, KT Corporation
KT wanted to expand its cloud services even more, however. “We were looking at providing broadband home users and mobile subscribers with Microsoft Office 2010 business productivity software at an affordable price,” says Young-Jin An, Manager, Software Business
Development at KT Corporation. “We wanted to make the full suite of Office 2010 applications available to customers, regardless of time and place so that they would not have to worry about paying for and installing the software on their own computers or mobile
KT planned to call the new product “Olleh Internet MS Office” a cloud-based service for subscribers to access Microsoft Office 2010 applications over the Internet.
What the company envisioned was a remote desktop services scenario for its subscribers. Remote desktop services are technologies that would enable KT subscribers to connect through the Internet to virtual desktops, RemoteApp programs, and session-based desktops
hosted at the Cheonan facility. Using a remote desktop scenario, KT could deploy and centrally manage applications on its own servers that hundreds of thousands of subscribers could use on their computers and mobile devices, while keeping each subscriber’s
settings and data secure.
To ensure the success of this new venture, KT needed to find the best remote desktop services technology that would match the company’s requirements. “We wanted to minimize management while ensuring a high level of reliability and performance with a consistent
experience across any device,” says An. “It was critically important that our first remote desktop services solution was a success, as this would open doors to other cloud services opportunities.”
KT Corporation decided to join the Rapid Deployment Program (RDP) for the Windows Server 2012 operating system to evaluate the new Remote Desktop Services feature within the latest Windows operating system from Microsoft. Remote Desktop Services offers
remoting infrastructure for session virtualization, a centralized desktop computing architecture where subscribers share a single operating system and application image—in this case Office 2010—within individual sessions on a Windows Server host server at
the Cheonan facility.
“Capital expenditures can be much less than it is for virtual desktops, and a single remote desktop session host server can support more subscribers than the same server used for hosting virtual desktops,” says An.
KT was eager to take advantage of several new capabilities within Windows Server 2012 Remote Desktop Services. To reduce management of its proposed cloud-based service, KT wanted to simplify session virtualization deployment and administration. Server Manager,
which comes built into Windows Server 2012, provides a centralized management console for the KT administrators who manage virtual desktops.
To deploy session virtualization for Olleh Internet MS Office, KT IT staff installed Remote Desktop Session Host (RDSession Host) servers. Applications that run on the RD Session Host server are called RemoteApp applications. As a RemoteApp, Office 2010 appears
to subscribers as though it was running on their local computers, but only the subscriber’s keystrokes and mouse movements are sent to the server. The KT team used Windows Server 2012 Hyper-V virtualization technology to configure the RD Session Host servers
in a 16-node, failover cluster. IT staffers used File and Storage Services and deployed five, 2-node iSCSI-based file storage clusters that use the Internet Small Computer System Interface (iSCSI) protocol to store user profile information and subscribers’
KT enabled the Remote Desktop (RD) Web Access server to enable subscribers to connect through their browsers and use the RD Gateway server to obtain access to a RD Session Host server. Subscribers are assigned to a RD Session Host server by the RD Connection
Broker server, which also helps reconnect subscribers to their sessions in the event of a service interruption.
KT administrators are using Server Manager to centrally distribute and configure these different server components for Remote Desktop Services and to manage session collections, RemoteApps, and subscribers—all from a central management console. A session collection
(referred to as a “farm” in earlier versions of Windows Server) is a grouping of RD Session Host servers and is used to publish session-based desktops. “We are creating a session collection for every 20,000 subscribers,” says An.
KT is also participating in the Microsoft System Center 2012 Service Pack 1 (SP1) beta Technology Adoption Program because it is interested in using the product to help manage data center resources and its session virtualization solution. “KT is using System
Center 2012 SP1 beta to automatically scale out or scale in its virtual machines as needed,” says Lee.
||Windows Server 2012 Remote Desktop Services is a complete virtual desktop toolkit we can use to simplify the administration of a new service for subscribers that works on any platform.
| Young-Jin An
Manager, Software Business Development, KT Corporation
To improve subscribers’ experience, KT is using USB redirection capabilities within Remote Desktop Services and IT staffs are using Fair Share CPU Scheduling to dynamically distribute resources across sessions, which prevents any one subscriber’s session from
overusing disk, CPU, or bandwidth resources in a way that impacts other subscribers. “We are also using Windows Advanced Firewall to define which server can access the RD Session host and accompanying storage file servers,” says An.
Recently, KT upgraded from Office 2010 to Microsoft Office 2013 and now is providing Office 2013 to subscribers over the Internet.
KT Corporation is using Windows Server 2012 Remote Desktop Services as the foundation for a new service for its subscribers and to further its competitive advantage, while minimizing costs and growing the business.
Reduced Hardware Costs
With Windows Server 2012 Remote Desktop Services, KT Corporation expects to reduce hardware costs applicable to its new service offering. “By offering applications to subscribers through session virtualization, we can serve a greater number of customers per
host server, compared to assigning everyone a virtual desktop,” says An.
Windows Server 2012 makes life simpler for the KT IT staffers who manage the new session virtualization infrastructure. They are using Server Manager to administer groups of servers and to publish and manage RemoteApp programs and session-based desktop from
a central console.
“We have eliminated the inconvenience of having to connect to the server every time we need to perform an administrative task, which saves us at least an hour a day,” says An. “We plan on using System Center 2012 to reduce the six hours a week that we normally
spend on deploying system upgrades and security updates. We use Server Manager to install centralized, session-based desktops with one click, which reduces the time required to install each desktop.”
Enabled Reliable Performance, Great Customer Experience
To encourage rapid adoption of its new service, KT can now offer highly available access to Office 2013 for customers using a variety of computing platforms and form factors, including support for multipoint touchscreens and tablet PCs. KT can take advantage
of the fact that customers can disconnect from their sessions and reconnect from another location, saving time in resuming work environments and adding to the service’s convenience. And subscribers can connect USB-based devices, including USB flash drives,
to their PCs and portable computers to use while they are connected to a RD Session Host server to extend the functionality of their virtual sessions.
“Windows Server 2012 Remote Desktop Services is a complete virtual desktop toolkit we can use to simplify the administration of a new service for subscribers that works on any platform,” says An. “With Fair Share Computing working behind this new service offering,
we can ensure that our subscribers all enjoy the same level of reliability and performance as they access Office 2010 applications anytime, anywhere, on any device—PCs, iPads, tablet PCs, and Android devices.”
Supported a New Business Venture
By adopting Windows Server 2012 with Remote Desktop Services, KT can introduce a new service offering that will help build a competitive advantage with the company’s cloud-based services strategy. That’s because improvements to Remote Desktop Services within
Windows Server 2012 make it easier for KT to virtualize and offer applications and session-based desktops to large numbers of subscribers, while keeping storage and management costs down.
“It was not feasible to offer Remote Desktop Services for subscribers until Windows Server 2012 came along,” says An. “With our Windows Server 2012 session virtualization solution, we can offer an easily managed, cost-effective service that delivers applications
to subscribers. It’s a whole new business for us.”
Windows Server 2012
Windows Server drives many of the world’s largest data centers, empowers small businesses around the world, and delivers value to organizations of all sizes in between. Building on this legacy, Windows Server 2012 redefines the category, delivering hundreds
of new features and enhancements that span virtualization, networking, storage, user experience, cloud computing, automation, and more. Simply put, Windows Server 2012 helps you transform your IT operations to reduce costs and deliver a whole new level of
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