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Newer server rack cabinets come with adjustable mounting rails allowing the user to place the rails at a shorter depth if needed. There are a multitude of specialty server racks including soundproof server racks, air-conditioned server racks, NEMA-rated, seismic-rated, open frame, narrow, and even miniature 19-inch racks for smaller applications.
On the 720 line, Dell currently offers two rack-model servers: the Poweredge R720 [126] and the R720XD [127] — where the latter offers the option to extend the system to up to 26 internal disks. The Poweredge 620 series offer models for rack, tower and a ½ height blade-server M620. [125]
Rack is a modular interface between web servers and web applications developed in the Ruby programming language. With Rack, application programming interfaces (APIs) for web frameworks and middleware are wrapped into a single method call handling HTTP requests and responses .
Prior to the Generation 10 servers, the naming convention was as follows: First digit – Height of the server in rack units; Second digit – Generation of server (up to 9th generation) Third digit – Server type (5 for rack server, 0 for tower server, although tower servers could be outfitted with a rack chassis)
The choice of racks in a server room is usually the prime factor when determining space. Many organisations use telco racks or enclosed cabinets to make the most of the space they have. Today, with servers that are one-rack-unit (1U) high and new blade servers, a single 19- or 23-inch rack can accommodate anywhere from 42 to hundreds of servers.
A rack-mountable server with the top cover removed to reveal internal components. Hardware requirement for servers vary widely, depending on the server's purpose and its software. Servers often are more powerful and expensive than the clients that connect to them. The name server is used both for the hardware and software pieces.