Table 10. DS3500 dc power requirements (continued)
Requirement
Operating current 16 A to 11.2 A
Rated disconnect device (circuit-breaker) 20 A
Power recovery
After normal power is restored after a total ac or dc power failure, the storage
subsystem performs power-on recovery procedures automatically without operator
intervention.
Power cords and receptacles
The specifications of power cords and receptacles required to operate the DS3500
storage subsystem are listed in this topic.
Storage subsystems equipped with ac power supply and fan units come with two
ac jumper cords that are used to connect to the rack PDU. You must purchase the
power cords that are applicable for use in a typical receptacle in your country. See
“Power cords” on page 179 for more information.
Storage subsystems equipped with dc power supply and fan units come with two
dc jumper cables that are used to connect to the site -48 V dc power source. The
supplied dc jumper cables have 10 AWG copper conductor wires. 12 AWG or
larger copper conductor wires must be used for all of the wiring between the
DS3500 or EXP3500 dc power connectors and the dc power source. See the
“DS3524 storage subsystem and EXP3524 storage enclosure parts listing” on page
177 for more information.
Heat output, airflow, and cooling
The heat output, airflow, cooling configurations requirements, and best practices to
operate the DS3500 storage subsystem are specified in this topic.
Air enters at the front of the DS3500 storage subsystem and EXP3500 storage
enclosure and leaves at the back. Allow at least 30 inches in front of the DS3500
storage subsystem and EXP3500 storage enclosure and at least 24 inches at the rear
for service clearance, proper ventilation, and heat dissipation.
When racks that contain many DS3500 storage subsystems and EXP3500 storage
enclosures are to be installed together, the following requirements must be met to
ensure that the devices are adequately cooled:
v Air enters at the front of the rack and leaves at the back. To prevent the air that
is leaving the rack from entering the intake of another piece of equipment, you
must position the racks in alternate rows, back-to-back and front-to-front. This
arrangement is known as “cold aisle/hot aisle” and is shown in Figure 15 on
page 23.
v Where racks are in rows, each rack must touch the rack 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 enclosures that are in that rack. Use Suite Attach Kits
to completely seal any gaps that remain between the racks. For details about
Suite Attach Kits, contact your IBM marketing representative or authorized
reseller.
v Where racks are in rows front-to-front or back-to-back, gaps of at least 122 cm
(48 in.) must separate the rows across the cold aisle (see Figure 15 on page 23).
22 IBM System Storage DS3500 and EXP3500 Storage Subsystem: Installation, User's, and Maintenance Guide
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