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Conversely, a 4-Gbps SFP that is plugged into a 2-Gbps-capable port will be limited
by the speed of the port to a maximum of 2 Gbps.
Attention: Refer to the FRU option P/N on the SFP to identify the maximum
operating speed of the SFP and to request the correct FRU replacement.
Use the following procedure to replace a SFP module on the storage subsystem.
The SFP module shown in this procedure might look different from those you are
using, but the difference will not affect functionality. Figure 110 on page 162
illustrates installing an SFP module.
Electrostatic discharge can damage sensitive components. To prevent electrostatic
discharge damage to the storage subsystem, use proper antistatic protection when
handling components.
To replace an SFP module, perform the following steps:
1. Use the DS4000 Storage Manager client software to print a new storage
subsystem profile.
2. Using the Recovery Guru, identify the failed component that needs to be
replaced.
3. Check the Fault LEDs to locate the failed SFP module. If a fault is detected,
the amber Fault LED is on.
Attention: Potential loss of data access - To prevent loss of access to
data, remove only the SFP module that has a failed status in the storage
management software and has Port Bypass LED lit.
4. Put on antistatic protection.
5. Unpack the new SFP module. Verify that it is the same type of module you are
replacing. If it is not, contact IBM Customer and Technical Support.
Attention: Handle and install fiber-optic cables properly to avoid degraded
performance or loss of communications with devices. When working with
fiber-optic cables, do not pinch them, step on them, or locate them in aisles or
walkways. Do not overtighten the cable straps or bend the cables to a radius
smaller than 38 mm (1.5 inches).
6. Disconnect the interface cables from the SFP module.
7. Remove the failed SFP module from the controller.
8. Install the new SFP module into the controller.
9. Reconnect the interface cable.
Chapter 5. Replacing components 161