Power
recovery
after
a
dc
power
failure:
After a total dc power failure, after
normal power is restored, the storage expansion enclosure performs power-up
recovery procedures automatically without operator intervention.
Power
cords
and
receptacles:
The storage expansion enclosure ships with two
dc power jumper cables used to connect to the dc power source. See “Cabling the
dc power supply” on page 62 for more information.
Heat
output,
airflow,
and
cooling
See “Airflow and heat dissipation” on page 21 for heat output, airflow, and cooling
specifications.
Note:
In general, disk subsystem reliability tends to decrease as the ambient
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.
When racks that contain many storage expansion enclosures are to be installed
together, the following requirements must be met to ensure that the storage
expansion enclosures 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
and
hot
aisle
and is shown in Figure 14 on
page 25.
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 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.
v
Where racks 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.
v
To ensure correct airflow in each rack, the rack filler plates must be installed in
unused positions. Also, all the gaps in the front of the racks must be sealed,
including the gaps between the storage expansion enclosures.
24
IBM System Storage DS4000 EXP810 Storage Expansion Enclosure: Installation, User’s and Maintenance Guide
Summary of Contents for DS4000 EXP810
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