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Installation
20 IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide
2.4 SCM I/O Module Configurations
Important Please refer to section 2.9 for information on SATA drive configurations.
2.4.1 Internal Loop Structures
The DCS9550 1S1 Storage Expansion Unit is configured with one internal loop of 16 drives.
2.5 FC-AL Interface
The SCM (I/O) interface module provides an external FC-AL interface via SFP
connection.The SCM module facilitates the emulation of fibre channel drives by ATA/SATA
drives by converting FC protocols to ATA/SATA protocols. This is done through protocol
conversion on the SCM module, which directly connects to each drive using the serial ATA
protocol and then presents to the host via one FC loop hubbed to two or four SFP connections,
depending on configuration.
Note There are no external terminators required with Fibre Channel architecture
and any drive may be hot plugged during operation.
Figure 2–4 Installing an AC Power Supply Cooling Module (2)
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