Preparing your site

About this section

This section tabulates the following information:

Disk shelf dimensions
Disk shelf weight
Space requirements
Environmental requirements for operating or storing your disk shelf and storage appliance
Electrical requirements for your disk shelf

Your site must be capable of housing disk shelves with these requirements.

Disk shelf dimensions

The following table lists the dimensions of a single disk shelf.

Dimensions	U.S.	Metric
Height	5.25 in. or 3U, where 1U = 1.75 in.	13.3 cm
Width	17.6 in.	44.7 cm
Depth	20 in.	50.9 cm

Disk shelf weight

The following table lists the weight of a single disk shelf based on its configuration.

Weight	U.S.	Metric
When empty	50.6 lbs	23 kg
With 14 disk drives	77 lbs	35 kg

Space requirements

For the disk shelf to have the proper operating conditions, the front of the disk shelf must be at least 1 inch from the nearest obstruction. The back of the disk shelf must be at least 6 inches from the nearest obstruction.

Environmental conditions

The following table lists the maximum environmental conditions that your site must meet to properly run or store your disk shelf.

Environmental condition	Operating condition	Storage condition
Temperature range	50° F to 104° F (10° C to 40° C)	-40° F to 149° F (-40° C to 65° C)
Relative humidity (noncondensing)	5% to 95%	5% to 95% in original shipping container; otherwise, 50%.

Note
The recommended operating condition temperature range is 68 to 77º F (20 to 25º C).

Electrical requirements

Voltage and inrush current requirements

The following table lists the inrush current and input voltage requirements with power applied to the disk shelf.

Current type	Input voltage	Inrush current
AC	220V AC	50A
AC	110V AC	40A
DC	-60V DC to -40V DC	No greater than 20A under any conditions

Note
The DC power can operate from a -48V or a +48V DC source.

Power requirements

The following table describes the power requirements for the disk shelf connected to two 20A circuits based on a maximum PSU load.

Type of disk shelf	Volts	Amps per disk shelf	Maximum number of disk shelves
DS14	100V to 120V AC	3.95	4
	200V to 240V AC	1.90	8
	-60V to -40V DC	7.50	N/A
DS14mk2 FC	100V to 120V AC	4.40	4
DS14mk2 FC	200V to 240V AC	2.30	8

Caution
Exceeding the allowed number of disk shelves can lead to power brownouts.

Power consumption and thermal rating

The power consumption (in watts) and the number of BTUs per hour produced by the disk shelf depend on the number and type of devices (for example, power supplies, disks, and so on) installed in the disk shelf.

The following table gives an example of average power consumption for one disk shelf with 14 disks, two fan/power supply units, and two LRC modules.

Type of disk shelf	Power consumption	Thermal rating
DS14	350W	1,195 BTU/hr.
DS14mk2 FC	440W	1,502 BTU/hr.