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Installing SFP modules
The DS4700 Express requires SFP modules. SFP modules convert electrical
signals to optical signals that are required for fibre channel transmission to and from
RAID controllers. After you install the SFP modules, you use fibre-optic cables to
connect the DS4700 Express to other fibre channel devices.
Before installing SFP modules and fibre-optic cables, read the following information:
v Do not mix long-wave SFPs and short-wave SFPs on a single storage
subsystem. Use only short-wave SFPs. You can use the DS4000 Storage
Manager client to view the Storage Subsystem Profile to verify that you are not
mixing long-wave and short-wave SFPs.
Attention: In addition, do not use long-wave SFPs or GBICs in any of the fibre
channel ports in the DS4700 Express controllers. (Long-wave SFPs and GBICs
are not supported for use in the DS4700 Express or any of the attached DS4000
storage expansion enclosures.)
v The SFP module housing has an integral guide key that is designed to prevent
you from inserting the SFP module improperly.
v Use minimal pressure when inserting an SFP module into an SFP port. Forcing
the SFP module into a port could cause damage to the SFP module or to the
port.
v You can insert or remove the SFP module while the port is powered on.
v Do not install an SFP in any port that will not have a fibre optic cable attached.
Additionally, it is recommended that you remove any SFP from any port that does
not have fibre optic cables attached.
v The operational or redundant loop performance is not affected when you install
or remove an SFP module.
v You must insert the SFP module into a port before you connect the fiber-optic
cable.
1.5 inch
(38 mm)
radius
3.0 inch
(76 mm)
diameter
ds470104
Figure 33. Recommended bending and looping specifications for fibre-optic cables
58 IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide