IBM N Series, Hardware Manual

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Chapter 2. Entry-level systems
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Figure 2-6 shows the rear view of the N3220.
Figure 2-6 N3220 rear view
Figure 2-5 shows the N3220 Single-Controller in chassis.
Figure 2-7 N3220 Dual-Controller in chassis (including optional mezzanine card)
2.5 N3240 model details
This section describes the N series 3240 models.
2.5.1 N3240 model 2857-A14
N3240 Model A14 is designed to provide a single-node storage controller with HTTP, iSCSI,
NFS, CIFS, and FCP support through optional features. The N3240 Model A14 is a 4U
storage controller that must be mounted in a standard 19-inch rack. Model A14 can be
upgraded to a Model A24. However, this is a disruptive upgrade.
2.5.2 N3240 model 2857-A24
N3240 Model A24 is designed to provide identical functions as the single-node Model A14.
However, it includes a second Processor Control Module and CFO licensed function. Model
A24 consists of two Processor Control Modules that are designed to provide failover and
failback function, which helps improve overall availability. Model A24 is a 4U rack-mountable
storage controller.