:- A rack server, also referred to as a rack-mount server, is the standard size server used for mounting inside a datacenter server cabinet or rack frame infrastructure. A single rack server is 19″w x 1.75″h. This is referred to as a 1U rack server which is short form for 1 unit. Rack serversare most commonly available in 1U, 2U and 4U sizes. A standard rack-mount server cabinet is 42U in height. The front panel a rack server is mounted to the vertical cabinet rail posts using typical nuts and bolts.
Due to their minimized height and ability to be mounted on top of one another with minimum space in between, rack servers offer much higher datacenter density than tower servers, but less so than blade servers. As with tower servers, rack servers are connected using traditional network cables and power cords.