Dedicated Server Colocation
Dedicated Server Colocation gives you the greatest flexibility. You get to choose the hardware configuration of the server and the software that goes on it. The hosting company maintains the connection to the Internet and deals with environmental details such as uninterruptible power supplies (UPSs), fire controls, and air conditioning. On the other hand, you're responsible for that server's upkeep.
Companies that offer colocation say they're moving away from this service and encouraging their customers to rent a dedicated server. This means renting an entire server from the hosting service, but having the hosting company service and maintain it.
It is important to choose a colocation provider that either has their own data center or has a presence in one of the leading "data hotels." World Class data centres are located in major industrial cities (New York, London, Frankfurt for example). Here they are able to take advantage of the convergence of high capacity network connectivity that occurs in a major commercial centre. For instance fibre, and metrolinks and ease of connection to major Points of Presence (POPS) to the major telco's. For this reason only a very few of the leading ISP's or colocation specialist operate their own dedicated centre's due to the costs of providing remote connectivity, redundant power sources, air conditioning and filtered clean air.