User guide

Galaxy 55 User Guide
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2.2.1 Enclosure Bay Numbering Convention
The enclosure bay numbering convention is shown in Figure 2–1. A Bay is defined as the space required to house
a single 1.6" high 3.5 inch disk drive in its carrier module. e.g. a 1 x 3 bay module would take the space of 1 drive
width by 3 drive bays high (in the rack mount configuration).
The Galaxy 55 subsystem is housed in a 4 x 3 enclosure, i.e. 4 bays wide by 3 bays high. The front bays are
numbered 1 to 4 from left to right, viewed from the front. The rear bays are numbered 1 to 4 from right to left,
viewed form the rear. Bays are numbered from 1 (top row) to 3 (bottom row). Module locations are identified from
a matrix of the top and side numbers, e.g. the ESI/Ops Panel should only be installed in rear bay 3/1 (top, middle
row, when viewed from the rear).
ESI/Ops Panel Install in Rear Bay 3/1
Blank plates Rear blank plates MUST be fitted to ALL unused bays, there will be inadequate drive
cooling if any are left off.
Table 2–2 Minimum PSU Configurations
Average Operating
Drive Power
Minimum No. PSUs
(12 drives of same type installed)
No. PSUs with
Redundancy
<13 1 2
14 - 21 2 2
22 - 28 3 3
Figure 2–1 Module Locations
Table 2–1 Galaxy 55 Configuration
Module Location