# Rack view specification syntax

The specification of a rack view features two required and two optional key-value pairs, which are described in the following table. The value for each key is a positive integer.

Key Type Description
ru Required The lowest rack unit used by the device.
rh Required The height of the device, in rack units.
st Optional The rack slot.
sc Optional The slot capacity; only for chassis devices.

The syntax of a rack view specification is a comma-separated list. The following example specifies a 1u device in the second rack unit for a device named beta.zenoss.loc:

ru=2,rh=1

In the preceding example, no rack slot value is included, because there is only one device.