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AC power recovery
After normal power is restored after a total AC power failure, the storage subsystem
performs power-up recovery procedures automatically without operator intervention.
Power cords and receptacles
The storage subsystem ships with two jumper cords used to connect to the rack
PDU. You must purchase the power cords that are appropriate for use in a typical
outlet in the destination country. See Appendix C, "Power cords," on page 149 for
more information.
Heat output, airflow, and cooling
See "Airflow and heat dissipation" on page 18 for heat output, airflow, and cooling
specifications.
Note: In general, disk subsystem reliability tends to decrease as the ambient
When racks that contain many DS4200 Expresss are to be installed together, the
following requirements must be met to ensure that the DS4200 Expresss are
adequately cooled:
v Air enters at the front of the rack and leaves at the back. To prevent the air that
v Where racks are in rows, each rack must touch the rack that is next to it to
v Where racks are in rows front-to-front or back-to-back, a gap of at least 1220 mm
v To ensure correct airflow in each rack, the rack filler plates must be installed in
20
IBM System Storage DS4200 Express Storage Subsystem: Installation, User's and Maintenance Guide
temperature of the environment in which it is being used increases. The
ambient temperature in the immediate area of the disk enclosure unit should
be kept near 22° C (72° F), or lower, to provide better reliability.
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 9 on page
21.
reduce the amount of hot air that can flow around from the back of the rack into
the intakes of the storage expansion enclosures that are in that rack. You should
use Suite Attach Kits to completely seal any gaps that remain between the racks.
For details about Suite Attach Kits, contact your marketing representative.
(48 in.) must separate the rows across the cold aisle.
unused positions. Also, all the gaps in the front of the racks must be sealed,
including the gaps between the storage subsystems.
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