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In the current naming scheme, towers are designated by T, racks by R, and blades by M (for modular). [1] The 19″ rack-servers come in different physical heights expressed in rack units or U. Most modern servers are either 1U or 2U high while in the past the 4U was more common.
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 ML (Modular Line) line of servers features a modular design that is designed for maximum system expansion, while the DL (Density Line) line of servers consists of powerful, density-optimized servers designed for rack mounted use. [4] Though not officially labeled as such, this generation of ProLiant servers is also referred to as "Gen1".
As of the end of Q2 2015, Facebook's Prineville data center had a power usage effectiveness (PUE) of 1.078 and its Forest City data center had a PUE of 1.082. [ 15 ] In October 2015, Allied Control has a claimed PUE ratio of 1.02 [ 16 ] through the use of two-phase immersion cooling using 3M Novec 7100 fluid.
All power supplies and fan-units are inserted from the back and are all hot-swappable. [2] The power supplies are located at the bottom of the enclosure while the fan-units are located next to and in between the switch or I/O modules. Each power-supply is a 2700-watt power-supply and uses 208–240 V AC as input voltage.
Home servers can be implemented do-it-yourself style with a re-purposed, older computer, or a plug computer; pre-configured commercial home server appliances are also available. An uninterruptible power supply is sometimes used in case of power outages that can possibly corrupt data.