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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]
The power measurement is often the average power used while running the benchmark, but other measures of power usage may be employed (e.g. peak power, idle power). For example, the early UNIVAC I computer performed approximately 0.015 operations per watt-second (performing 1,905 operations per second (OPS), while consuming 125 kW).
The cluster is made of server racks at 2 configurations: 40 x 1u per side with 2 sides, or 20 x 2u per side with 2 sides. The power consumption is 10 kW per rack, at a density of 400 W/ft^2, consuming 10 MWh per month, costing $1,500 per month.
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.
Energy use is a central issue for data centers. Power draw ranges from a few kW for a rack of servers in a closet to several tens of MW for large facilities. Some facilities have power densities more than 100 times that of a typical office building. [79]
In 2000, the current ML and DL product lines were introduced. The ProLiant ML line comprises tower-based servers (convertible to rack mount) with capacity for internal expansion of disks and interconnects, while the DL line comprises general-purpose rack mount servers. Both the ProLiant ML and DL lines were inherited by HP (and HPE) after ...