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Chapter 1: Introduction
• Drive bays with drive tray canisters: The drive bays are used to house the
subsystem hard drives.
The
A12U contains 12 drive bays while the A08U contains
8 drive bays with a blank plate covering the lower part of the front panel.
1.1.3.4 Hard Drive Numbering
The subsystems are housed in an enclosure that is 4 bays wide and 3 or 2 bays high.
When viewed from the front, drive bays (slots) are numbered 1 to 12 (See Figure 1-
7) or 1 to 8 (See Figure 1-8), from the left to the right, and then from the top to the
bottom.
Figure 1-7: A12U Drive Bays Numbering Sequence
Figure 1-8: A08U Drive Bays Numbering Sequence
1.1.3.5 Rear Panel Overview
The rear section of the subsystems are accessed through the rear panel and is reserved
for a single RAID controller module, one (1) battery backup unit (BBU), two (2)
power supply units (PSUs), and three (3-A12U) or two (2-A08U) cooling fan
modules.
The subsystem rear views are shown in Figure 1-9 and Figure 1-10. A description
of each rear panel component is given in the proceeding discussions:
1
-
5
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