Pick a server old rack with sufficient internal space to home your current equipment and ensure that you have ample space to accommodate planned future expansion too as any unplanned equipment purchases. Rackmount gear is measured in the Electronic Industries Alliance (EIA) standard "Rack Units" or Rack "U". 1 "Rack Unit" is equal to 1.75" in height. Hold in mind that space for accessories, such as environmental monitoring devices, remote energy management devices, rack mount LCD monitors, and battery back-up, may be necessary. For example, if you must accommodate 20 2U servers, you would likely desire to choose a rack with a height of 44U to accommodate accessories such as a 1U patch panel, as well as a 2U UPS back-up battery. A rack's internal height is measured from the tallest point of any side rail for the bottom chassis; internal depth is measured from the insides of both front and rear doors; and internal width is measured from 1 side panel to the other. Be certain that the rack's external dimensions can be accommodated within the floor space allotted for it, check that it can be safely moved by way of all doorways, and ensure that its placement meets any relevant clearance or security regulations. As a note, constantly use acceptable rack-loading techniques, which includes placing heavy items in the bottom in the rack to stop a display showcase from becoming too top-heavy, have a plan about what you want to place toward the front and back of the rack (based on how considerably you will need to access or remove gear), and have someone help load gear that is heavy and/or above the height of the head. 
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