Definition of 1U, 2U, 3U, 4U, 5U, 6U, 7U (rack sizes)

1U, 2U, 3U, 4U, 5U, 6U and 7U are different sizes of rack servers.1U is equivalent to a rack unit, 2U to two racks and so on.

The rack unit is a unit of measure for the height of equipment prepared to be mounted in a 19 or 23-inch wide rack.The rack unit is equivalent to 1.75 inches (4,455 cm) tall.

While the width and length of the rack can be standard, the depth may vary.

Typical dimensions

1U: 19 "x 1.75" x 17.7 "19" x 1.75 "x 19.7" 19 "x 1.75" x 21.5 "

2U: 19 "x 3.5" x 17.7 "19" x 3.5 "x 20.9" 19 "x 3.5" x 24 "

3U: 17.1" x 5.1 "x 25.5"

4U: 19 "x 7" x 17.8 "19" x 7 "x 26.4"

5U: 19 "x 8.34" x 19.67 "19.1" x 8.75 "x 26.4"

6U: 19 "x 10.5" x 19.5 "

7U: 17" x 12.2 "x 19.8"

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