Reliability of a hosting, virtual or dedicated, is the whole complex of parameters. Some of these parameters are complex for estimating quantitatively. We shall list the major factors influencing reliability of a hosting:

Servers and the active network equipment from well proved manufacturers it is more reliable, than no-name the equipment. It concerns also the passive network equipment, cables, cases, sockets. The greater role is played with reliability of the climatic equipment - systems of ventilation and air-conditioning in where servers are located.

The software should be correctly adjusted and configured. At a choice of the software it is necessary to prefer well proved software products and combinations software. Correctly chosen ON, should be professionally established and adjusted, proceeding from problems of the client.

The level of technicians should be high. Support should be carried out in a mode 24/7. Presence of multilevel technical support is welcomed. The premise an arrangement of servers should be protected from not authorized access by a professional protection service.

It is necessary to choose systems of well proved manufacturer. In time to spend all necessary preventive works and test tests.

It is necessary item for any hosting server. Exception are hosting services constructed on the basis of cluster technologies. The most reliable systems are under construction on the basis of global clustering.

The personnel of the provider should conduct round-the-clock monitoring of servers. It allows to warn refusals of the equipment, to trace DOS-attacks and in due time to warn the client of necessity upgrade its equipment.

Blank in any of items of it, it is far not the full list of reliability of a hosting, can turn back accident for your site. If loading of a server, creation of backup copies can be stipulated in the contract on a hosting to estimate the majority of other parameters there is no opportunity. And it is not necessary if to recognize that malfunctions in any of these parts will lead to identical result - to falling of a server, its inaccessibility to your visitors.

Time in which current the server is in the stable condition, expressed in percentage of all time of supervision (so-called UpTime), characterizes reliability of a hosting.

It is clear, that 100 % UpTime to reach are impossible even because of obligatory procedural works on a server. But fast carrying out of these works and not less fast elimination of arising malfunctions is characteristic for a reliable hosting and significant influence on UpTime does not render.

One of the most convenient tools for definition UpTime, in my opinion, is presented on a site. This monitoring service provides 100 % reliability of measurements due to use of 3 independent centers (two Virginia and one in California), working in parallel. The information of any center which is not conterminous with data of two others, is cut and in the report does not join.