Considerations when selecting a rack by height : In selecting the height of your server rack, you will want to keep in mind both what the cabinet's external height is, and how many "U's" rack units of rack mountable equipment you need to fit in it.
Considerations when selecting a rack by depth : In selecting the depth of your server rack you will want to keep in mind the deepest piece of equipment you will be putting in the rack; and then add a couple additional inches for space to run your cables and power cords.
After you select the Rack Height you need above, you will then be able to select your Server Rack Depth and Server Rack Manufacturer, and configure your rack to your specific requirements.
External Height : Determining the correct rack height is extremely important. Not only should you consider both your current and future internal rack space requirements, but please be sure to allow enough room for ceiling clearance and any cabling or site requirements, as well as any dock or freight elevator limitations you may have. Rack Units : With the exception of some legacy equipment, monitors, and keyboards, most server and network equipment sold today is intended to be rack mounted.
So for example, if you have 20 x 2U high servers you need to mount, you will need a server rack that has at least 40U of rack space - keeping in mind any room you need for a KVM switch, UPS, patch panel, etc. Please note that actual internal and external height vary depending on rack manufacturer.
The amount of motion and resulting stress depends on the structural characteristics of the building and framework in which the equipment is contained, and the severity of the earthquake. Heavy equipment or equipment which is commonly accessed for servicing, for which attaching or detaching at all four corners simultaneously would pose a problem, is often not mounted directly onto the rack but instead is mounted via rails or slides.
A pair of rails is mounted directly onto the rack, and the equipment then slides into the rack along the rails, which support it. When in place, the equipment may also then be bolted to the rack. The rails may also be able to fully support the equipment in a position where it has been slid clear of the rack; this is useful for inspection or maintenance of equipment which will then be slid back into the rack.
Computer servers designed for rack-mounting can include a number of extra features to make the server easy to use in the rack:. When there are many computers in a single rack, it is impractical for each one to have its own separate keyboard, mouse, and monitor. Since the mounting hole arrangement is vertically symmetric, it is possible to mount rack-mountable equipment upside-down. However, not all equipment is suitable for this type of mounting.
For instance, most optical disc players will not work upside-down because the driving motor mechanism does not grip the disc. Racks are available with either four or two vertical rails. Four-post racks allow for mounting slides to support the equipment at the front and rear. These racks may be open in construction similar to the traditional open-style two-post racks , or may be enclosed by doors, side panels, or tops. Two-post racks provide just two vertical rails; a piece of equipment can be mounted either via its front panel holes, or close to its center of gravity to minimize load on its front panel.
Two-post racks are most often used for telecommunication installations. The posts are each 0. The posts have holes in them at regular intervals, with both posts matching, so that each hole is part of a horizontal pair with a center-to-center distance of The holes in the posts are arranged vertically in repeating sets of three, with center-to-center separations of 0.
The hole pattern thus repeats every 1. Racks are divided into regions, 1. Rack-mountable equipment is usually designed to occupy some integer number of U. For example, a storage array might be 4U high, and rack-mountable computers are most often 2U or 1U high.
Occasionally, one may see fractional U devices such as a 1. This document is not the EIA document, but an aggregate of various source containing specification from EIA and other sources. The specification also set tolerances on each of these dimensions. Vertical hole spacing is defined as a repeating pattern of holes within one Rack Unit of 1.
See the diagram below. This dimension is not well maintained on some racks, causing problems with equipment installation. Many manufacturers use equipment mounting slots instead of holes to allow for variations in this dimension.
The opening in the rack is specified as a minimum of Square hole racks tend to be very close to the minimum opening. The term 19 inch comes from the width of the front panel of the boxes that are installed in the rack see the image below. The hole spacing for standard inch racks on the mounting flange is spaced in groups of three holes. Manufactures of rackmount equipment make their product lines based upon how many rack units the equipment occupies in the server rack.
The three hole group spacing is measured from center hole to center hole and does not vary regardless of whether the server rack has square or round mounting holes. Flight Case Hardware.
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