52 IBM System Storage N series Hardware Guide
5.4.1 Overview
The EXN3500 includes the following hardware:
Dual, redundant, hot-pluggable, integrated power supplies and cooling fans
Dual, redundant, disk expansion unit switched controllers
24 SFF hard disk drive slots
Diagnostic and status LEDs
Figure 5-7 shows the EXN3500 front view.
Figure 5-7 EXN3500 front view
The EXN3500 SAS expansion unit can be shipped with no disk drives installed. Disk drives
ordered with the EXN3500 are installed by IBM in the plant before shipping. Disk drives can
be of 450 GB and 600 GB physical capacity, and must be ordered as features of the
EXN3500.
Figure 5-8 shows the rear view of the EXN3500, which highlights the connectivity and
resiliency.
Figure 5-8 EXN3500 rear view
Requirement: For an initial order of an N series system, at least one of the storage
expansion units must be ordered with at least five disk drive features.
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