IBM Partner Pavilion DS4100 manual Heat output, airflow, and cooling, Low Range High Range

Table 10. IBM TotalStorage DS4100 AC power requirements

	Low Range	High Range
Nominal Voltage	90 to 136 VAC	180 to 264 VAC
Frequency	50 to 60 Hz	50 to 60 Hz
Idle Current	2.50 Aa	1.33 Ab
Maximum Operating Current	3.01 Aa	1.57 Ab

a.Typical voltage: 115 V AC, 60 Hz at 77% power-supply efficiency and 0.96 power factor

b.Typical voltage: 230 V AC, 60 Hz at 77% power-supply efficiency and 0.96 power factor

Heat output, airflow, and cooling

The maximum heat output of the DS4100 is 390 watts (1235 BTU/hr). Each DS4100 rack-mounted unit requires an airflow of 2.5 m3 (87 ft3) per minute. The input air temperature to all rack cabinets should be in the range 10° C - 35° C (50° F - 95° F). The recommended operating temperature is 22° C (72° F).

When rack cabinets that contain many DS4100s are to be installed together, the following requirements must be met to ensure that the DS4100s are adequately cooled:

vAir enters at the front of the rack cabinet and leaves at the back. To prevent the air that is leaving the rack cabinet from entering the intake of another piece of equipment, you must position the rack cabinets in alternate rows, back-to-back and front-to-front. This arrangement is known as “cold aisle/hot aisle” and is shown in Figure 8 on page 16.

vWhere rack cabinets are in rows, each rack cabinet must touch the rack cabinet that is next to it to reduce the amount of hot air that can flow around from the back of the rack into the intakes of the storage servers that are in that rack cabinet. You should use Suite Attach Kits to completely seal any gaps that remain between the rack cabinets. For details about Suite Attach Kits, contact your marketing representative.

vWhere rack cabinets are in rows front-to-front or back-to-back, a gap of at least 1220 mm (48 in.) must separate the rows across the cold aisle.

vTo ensure correct airflow in each rack cabinet, the rack filler plates must be installed in unused positions. Also, all the gaps in the front of the rack cabinets must be sealed, including the gaps between the storage servers.

Chapter 1. Introduction 15