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SFP modules
The DS4200 Express Storage Subsystem supports a fiber optic interface for host
and storage expansion enclosure connections. You must install a Small Form-factor
Pluggable (SFP) module in each interface connector on the controller where a fiber
optic cable is to be installed. The DS4200 Express Storage Subsystem host ports
support 1, 2 and 4 Gbps fibre channel speeds. The DS4200 Express Storage
Subsystem drive ports support only 2 and 4 Gbps fibre channel speeds.
Note: When attaching only EXP420 storage expansion enclosures to the DS4200
Attention:
speed of the fibre channel port in which the SFP is installed. For example, a
2-Gbps SFP that is plugged into a 4-Gbps-capable port limits the speed of that port
to a maximum of 2 Gbps. Carefully check the SFP's IBM part number, option
number, and FRU part number to identify its speed. There are no physical features
that distinguish a 4 Gbps from a 2 Gbps SFP.
Figure 6 shows an example of SFP module with fiber optic cable.
Note: The SFP module and the fibre optic cable shown are for illustrative purposes
Figure 6. SFP module and fiber optic cable
Software and hardware compatibility and upgrades
The latest DS4000 controller firmware and NVSRAM, the storage expansion
enclosure drive enclosure ESM firmware, and the fibre channel drive CRUs
firmware must be installed to ensure optimal functionality, manageability, and
reliability.
Software and firmware support code upgrades
To enable support for the DS4200 Express, you must ensure that your system's
software and firmware are at the levels shown in Table 5 on page 14:
Express, set the DS4200 Express enclosure speed to 4 Gbps.
The speed of the SFP module determines the maximum operating
only. The actual SFP module and the fibre optic cable shape may look
different from the figure shown.
SFP
Module
Fiber-optic
cable
13
Chapter 1. Introduction
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