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Dedicated Server
A dedicated hosting service, dedicated server, or managed hosting service is a type of Internet hosting in which the client leases an entire server not shared with anyone. This is more flexible than shared hosting, as organizations have full control over the server(s), including choice of operating system.
Managed Dedicated Server
Managed dedicated server To date, no industry standards have been set to clearly define the management role of dedicated server providers. What this means is that each provider will use industry standard terms, but each provider will define them differently. For some dedicated server providers.
SQL ServerCompact Edition
The compact edition is an embedded database engine. Unlike the other editions of SQL Server, the SQL CE engine is based on SQL Mobile (initially designed for use with hand-held devices) and does not share the same binaries.
SQl Server Architecture
When writing code for SQL CLR, data stored in SQL Server databases can be accessed using the ADO.NET APIs like any other managed application that accesses SQL Server data.
Bandwidth and Connectivity
Bandwidth refers to the data transfer rate or the amount of data that can be carried from one point to another in a given time period (usually a second) and is often represented in bits (of data) per second (bit/s).
Tuesday, May 10, 2011
Monday, May 9, 2011
Colocation centre
Colocation centre
A colocation centre (also spelled collocation, colo, or coloc) or carrier hotel is a type of data center where colocation services are provided. Colocation allows multiple customers to locate network, server, and storage gear- and connect them to a variety of telecommunications and network service providers- with a minimum of cost and complexity. Most Internet exchange points provide colocation.
Benefits
Increasingly, organizations are recognizing the benefits of colocating their mission-critical equipment within a data centre. Colocation is becoming popular because of the time and cost savings a company can realize as result of using shared data centre infrastructure. Significant benefits of scale (large power and mechanical systems) result in large colocation facilities, typically 4500 to 9500 square metres (roughly 50000 to 100000 square feet). With IT and communications facilities in safe, secure hands, telecommunications, internet, ASP and content providers, as well as enterprises, enjoy less latency and the freedom to focus on their core business.
Additionally, customers reduce their traffic back-haul costs and free up their internal networks for other uses. Moreover, by outsourcing network traffic to a colocation service provider with greater bandwidth capacity, web site access speeds should improve considerably.
Major types of colocation customers are:
- Web commerce companies, who use the facilities for a safe environment and cost-effective, redundant connections to the Internet
- Major enterprises, who use the facility for disaster avoidance, offsite data backup and business continuity
- Telecommunication companies, who use the facilities to interexchange traffic with other telecommunications companies and access to potential clients
Buildings with data centres inside them are often easy to recognize due to the amount of cooling equipment located outside or on the roof. There are a lot of other special characteristics to a colocation centre as well:
A room in the Telecity colocation centre in Aubervilliers, a suburb of Paris
A typical server rack, commonly seen in colocation
- Fire protection systems, including passive and active design elements, as well as implementation of fire prevention programmes in operations. Smoke detectors are usually installed to provide early warning of a developing fire by detecting particles generated by smouldering components prior to the development of flame. This allows investigation, interruption of power, and manual fire suppression using hand held fire extinguishers before the fire grows to a large size. A fire sprinkler system is often provided to control a full scale fire if it develops. Clean agent fire suppression gaseous systems are sometimes installed to suppress a fire earlier than the fire sprinkler system. Passive fire protection elements include the installation of fire walls around the space, so a fire can be restricted to a portion of the facility for a limited time in the event of the failure of the active fire protection systems, or if they are not installed.
- 19-inch racks for data equipment and servers, 23-inch racks for telecommunications equipment.
- Cabinets and cages for physical access control over tenants' equipment.
- Overhead cable rack (tray) and fibreguide, power cables usually on separate rack from data.
- Air conditioning is used to control the temperature and humidity in the space. ASHRAE recommends a temperature range and humidity range for optimal electronic equipment conditions versus environmental issues.[citation needed] The electrical power used by the electronic equipment is converted to heat, which is rejected to the ambient air in the data centre space. Unless the heat is removed, the ambient temperature will rise, resulting in electronic equipment malfunction. By controlling the space air temperature, the server components at the board level are kept within the manufacturer's specified temperature/humidity range. Air conditioning systems help control space humidity within acceptable parameters by cooling the return space air below the dew point. Too much humidity and water may begin to condense on internal components. In case of a dry atmosphere, ancillary humidification systems may add water vapour to the space if the space humidity is too low, which can result in static electricity discharge problems which may damage components.
- Low-impedance electrical ground.
- Few, if any, windows.
Physical security
Most colocation centres have high levels of physical security, and may be guarded continuously. They may employ CCTV.
Some colocation facilities require that employees escort customers, especially if there are not individual locked cages/cabinets for each customer. In other facilities, a PIN code or proximity card access system may allow customers access into the building, and individual cages /cabinets have locks. Biometric security measures, such as fingerprint recognition, voice recognition and "weight matching", are also becoming more commonplace in modern facilities.
Power
Colocation facilities generally have generators that start automatically when utility power fails, usually running on diesel fuel. These generators may have varying levels of redundancy, depending on how the facility is built.
Generators do not start instantaneously, so colocation facilities usually have battery backup systems. In many facilities, the operator of the facility provides large inverters to provide AC power from the batteries. In other cases, the customers may install smaller UPSes in their racks.
Some customers choose to use equipment that is powered directly by 48VDC (nominal) battery banks. This may provide better energy efficiency, and may reduce the number of parts that can fail.
An alternative to batteries is a motor generator connected to a flywheel and diesel engine.
Many colocation facilities can provide A and B power feeds to customer equipment, and high end servers and telecommunications equipment often can have two power supplies installed.
Colocation facilities are sometimes connected to multiple sections of the utility power grid for additional reliability.
Cooling
The operator of a colocation facility generally provides air conditioning for the computer and telecommunications equipment in the building. The cooling system generally includes some degree of redundancy
In older facilities, the cooling system capacity often limits the amount of equipment that can operate in the building, more so than the available square footage.
Internal connections
Colocation facility owners have differing rules regarding cross connects between their customers. These rules may allow customers to run such connections at no charge, or allow customers to order such connections for a significant monthly fee. They may allow customers to order cross connects to carriers, but not to other customers.
Some colocation centres feature a "meet-me-room" where the different carriers housed in the centre can efficiently exchange data.
Most peering points sit in colocation centres.
Because of the high concentration of servers inside larger colocation centres, most carriers will be interested in bringing direct connections to such buildings.
In many cases there will be a larger Internet Exchange hosted inside a colocation centre, where customers can connect for peering.
External connections
Colocation facilities generally have multiple locations for fiber optic cables to enter the building, to provide redundancy so that communications can continue if one bundle of cables is damaged. Some also have wireless backup connections, for example via satellite.
Sunday, May 8, 2011
Free Web Hosting
A free web hosting service is a web hosting service that is free, usually advertisement-supported. Free web hosts will usually provide a subdomain (yoursite.example.com) or a directory (www.example.com/~yourname). In contrast, paid web hosts will usually provide a second-level domain along with the hosting (www.yourname.com). Many free hosts do allow use of separately-purchased domains. Rarely, a free host may also operate as a domain name registrar.
File hosting on free webhosts
Many free web hosting services discourage the use of their free web hosting services for file or image hosting only in which no web page is established or setup resulting in the use of bandwidth due to hot linking of files with no revenue gain to the service provider in the case of advertising supported services. As a result, hot linking or remote linking or inclusion of many image, media and download file formats is disabled or not permitted on many free web hosting services.
Other common limitations on file hosting limits on free hosts are limits on file size, for example no files over 5 MB or file types such as programs or large media files such as MP3.
This has resulted in the growth of free hosting services dedicated to image hosting, video hosting and general file hosting which permit remote hotlinking of files and larger file formats.
Co-branding and resellers
These let you brand fixed plans with your own company. Other services, offer WHM or panel reselling. This allows the client to develop his or her own web hosting plans and business.
Some customization commonly afforded to the co-branding or reseller owner would be the ability to set service quotas, to add, enable, disable or remove features of resold accounts, custom reseller or co-branded website, private label DNS and backend services among other items to differentiate the individual's service from the parent company of which they are a reseller or co-branded provider.
The key difference between co-branded and reseller services is the level of customization afforded to the individual setting up their own free hosting service and the level of autonomy afforded to the individual service owner.
This is a comparison of free web hosting services.
File hosting on free webhosts
Many free web hosting services discourage the use of their free web hosting services for file or image hosting only in which no web page is established or setup resulting in the use of bandwidth due to hot linking of files with no revenue gain to the service provider in the case of advertising supported services. As a result, hot linking or remote linking or inclusion of many image, media and download file formats is disabled or not permitted on many free web hosting services.
Other common limitations on file hosting limits on free hosts are limits on file size, for example no files over 5 MB or file types such as programs or large media files such as MP3.
This has resulted in the growth of free hosting services dedicated to image hosting, video hosting and general file hosting which permit remote hotlinking of files and larger file formats.
Co-branding and resellers
These let you brand fixed plans with your own company. Other services, offer WHM or panel reselling. This allows the client to develop his or her own web hosting plans and business.
Some customization commonly afforded to the co-branding or reseller owner would be the ability to set service quotas, to add, enable, disable or remove features of resold accounts, custom reseller or co-branded website, private label DNS and backend services among other items to differentiate the individual's service from the parent company of which they are a reseller or co-branded provider.
The key difference between co-branded and reseller services is the level of customization afforded to the individual setting up their own free hosting service and the level of autonomy afforded to the individual service owner.
This is a comparison of free web hosting services.
Company | Since | Storage | Bandwidth | File size limit | FTP upload | SSH | Page builder | Templates | Ad-free | Blog | Domain registration | Archive site | |
Angelfire | Lycos | ? | 20 MB | 1 GB/mo | ? | Paid Only | ? | ? | ? | ? | ? | ? | ? |
Edicy | Edicy | 2008 | 100 MB | Unlimited | 50 MB | No | ? | Yes | Yes | Yes | Yes | Yes | Yes |
FortuneCity | FortuneCity | 1996 | 1 GB | Unlimited | 1 MB | Yes | ? | Yes | Yes | No | Yes | Yes | ? |
Google Sites | Google | 2008 | 100 MB | ? | limited | No | ? | Yes | Yes | Yes | Yes | No | ? |
Jimdo | Jimdo | 2007 | 500 MB | ? | 10 MB | No | ? | Yes | Yes | No | Yes | Yes | ? |
Jux | Jux | 2011 | 1 GB | Unlimited | Unlimited | WebDAV | No | Yes | Yes | Yes | Yes | Yes | ? |
Lifeyo | Scape Networks | 2010 | 500 MB | ? | 10 MB | No | ? | Yes | Yes | Yes | Yes | Yes | ? |
Tripod.com | Lycos | 1995 | 20 MB | 1 GB | ? | No | ? | Yes | Yes | No | Yes | Yes | ? |
uCoz | uCoz Media | 2005 | 400MB | Unlimited | ? | Yes | ? | Yes | Yes | No | Yes | Yes | |
Webnode | Webnode | 2008 | 100 MB | 1 GB | 100 MB | No | ? | Yes | Yes | No | Yes | Yes | No |
Webs | FreeWebs | 2001 | 40+ MB | 100+ MB | ? | Yes | ? | Yes | Yes | No | Yes | Yes | Yes |
Weebly | Weebly | 2006 | Unlimited | Unlimited | 5 MB | No | ? | Yes | Yes | Yes | Yes | Yes | Yes |
Wix.com | Wix.com | ? | ? | ? | ? | ? | ? | Yes | Yes | No | ? | Yes | ? |
Yola | Yola | 2007 | 1 GB | Unlimited | 15 MB | No | ? | Yes | Yes | Yes | Yes | Yes | ? |
Obtaining hosting
Web hosting is often provided as part of a general Internet access plan; there are many free and paid providers offering these
A customer needs to evaluate the requirements of the application to choose what kind of hosting to use. Such considerations include database server software, scripting software, and operating system. Most hosting providers provide Linux-based web hosting which offers a wide range of different software. A typical configuration for a Linux server is the LAMP platform: Linux, Apache, MySQL, and PHP/Perl/Python. The web hosting client may want to have other services, such as email for their business domain, databases or multi-media services for streaming media. A customer may also choose Windows as the hosting platform. The customer still can choose from PHP, Perl, and Python but may also use ASP .Net or Classic ASP. Web hosting packages often include a Web Content Management System, so the end-user does not have to worry about the more technical aspects.
A customer needs to evaluate the requirements of the application to choose what kind of hosting to use. Such considerations include database server software, scripting software, and operating system. Most hosting providers provide Linux-based web hosting which offers a wide range of different software. A typical configuration for a Linux server is the LAMP platform: Linux, Apache, MySQL, and PHP/Perl/Python. The web hosting client may want to have other services, such as email for their business domain, databases or multi-media services for streaming media. A customer may also choose Windows as the hosting platform. The customer still can choose from PHP, Perl, and Python but may also use ASP .Net or Classic ASP. Web hosting packages often include a Web Content Management System, so the end-user does not have to worry about the more technical aspects.
Tuesday, May 3, 2011
Dedicated hosting service Security
Dedicated hosting server providers utilize extreme security measures to ensure the safety of data stored on their network of servers. Providers will often deploy various software programs for scanning systems and networks for obtrusive invaders, spammers, hackers, and other harmful problems such as Trojans, worms, and crashers (Sending multiple connections). Linux and Windows use different software for security protection.
