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v Do not overtighten the cable straps or bend the cables to a diameter of less than
v Do not put excess weight on the cable at the connection point. Be sure that the
v The following are the recommended maximum cable lengths:
Installing SFP modules
The DS4200 Express host and drive interface ports require 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 fiber-optic cables to connect the DS4200 Express to other fibre
channel devices.
Before installing SFP modules and fiber-optic cables, read the following information:
v Do not mix long-wave SFPs and short-wave SFPs on a single storage
v The SFP module housing has an integral guide key that is designed to prevent
v Use minimal pressure when inserting an SFP module into an SFP port. Forcing
v You can insert or remove the SFP module while the port is powered on.
v The operational or redundant loop performance is not affected when you install
v You must insert the SFP module into a port before you connect the fiber-optic
v You must remove the fiber-optic cable from the SFP module before you remove
v The speed of the SFP module determines the maximum operating speed of the
Statement 3:
76 mm (3 in.), or a radius less than 38 mm (1.5 in.).
cable is well supported.
– 1 Gbps: 500 meters 50/125 um fiber, 300 meters 62.5/125 um fiber
– 2 Gbps: 300 meters 50/125 um fiber, 150 meters 62.5/125 um fiber
– 4 Gbps: 150 meters 50/125 um fiber, 70 meters 62.5/125 um fiber
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 DS4200 Express controllers. (Long-wave SFPs and GBICs
are not supported for use in the DS4200 Express or any of the attached DS4000
storage expansion enclosures. Long-wave SFPs and GBICs are only supported
in the fibre channel switch ports to which the DS4200 Express Storage
Subsystem connects.)
you from inserting the SFP module improperly.
the SFP module into a port could cause damage to the SFP module or to the
port.
or remove an SFP module.
cable.
the SFP module from the port. Refer to "Removing SFP modules" on page 47 for
more information.
fibre channel port in which the SFP is installed. For example, a 2-Gbps SFP that
is plugged into a 4-Gbps-capable port will limit the speed of that port to a
maximum of 2 Gbps.
Attention:
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.
Chapter 3. Cabling the storage subsystem
45
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