As many of us know that if we lost any important application on a normal server, what happens? The server goes down making the websites inaccessible residing over it. Server clustering is a technology which creates a group of multiple servers which are running independently but acts as a single system, mostly on Windows Server 2003, Enterprise Edition, or Windows Server 2003, Data-center Edition. Whenever one of these server fails all workload and resources required for keeping the server running are transferred to another servers included in that particular cluster. Having ability to work with each other’s support this cluster technology provides higher level of services and redundant to it’s clients. The inconvenience due to server failure does not has the place at all because other servers within the cluster carries out the job of server failed. The website hosting companies and website hosting client both have a huge advantage of this technology as, uptime-guarantee, security level and data redundancy are get improved on a maximum level with this technology.

A data center is a premises where the servers stores the data, a room with complete security for the servers as well as environmental considerations such as cooling requirements. A data center is also called as lights out server room that contains lock and key which is kept in the dark. It generally includes redundant or backup power supplies, redundant data communications connections, environmental controls (e.g., air conditioning, fire suppression) and security devices.

A Data Center is also called as Server Farm used to house computer systems and associated components, such as telecommunications and storage systems.

Data Centers are authorized subordinate organizations by Internet Registries. Data Centers play an important role between the RIR – Regional Internet Registries and the Internet User as it routes the network to access the data from any part of the world. The server’s on the internet are located at Data Centers. The boom of data centers came during the dot-com bubble. Companies needed fast Internet connectivity and nonstop operations to deploy systems and establish a presence on the Internet. Installing such equipment was not viable for many smaller companies. Many companies started building very large facilities, called Internet data centers (IDCs), which provide businesses with a range of solutions for systems deployment and operation.

Requirements for modern data centers
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1. High standards for assuring the integrity and functionality of its hosted computer environment.

2. Redundancy of both fiber optic cables and power, which includes emergency backup power generation.

3. 19-inch racks mounted for storing servers.

4. Air Conditioner’s to maintain the temperature range of 20–25 °C (68–75 °F) and humidity range of 40–55% with a maximum dew point of 17°C as optimal for data center conditions.