The 1U, 2U, 3U, 4U, 5U, 6U and 7U are all different
sized rackmount servers;
the U following the number
is short for unit. The number indicates the size of the rackmount,
1U being the smallest rackmount and 7U being the biggest rackmount.
Below is a listing of each of the different units and their
dimensions, although the Width
and Height
of a rackmount may be standard,
the depth
of a rackmount may change, as can be seen below. If
your rackmount server is going to be placed in a constrained
area, it's best to verify with the manufacturer of the rackmount
what the exact dimensions are.
Unit |
Dimension
(W x H x D) |
| 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" |
Most collocations and ISPs
accept 1U, 2U and/or 5U chassis;
however, it is still a good idea to check
with whomever is planning to host
your server
to verify what they support
and at what cost.
Also see: Chassis, Network
definitions
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