Attention
Never remove a controller, power supply and fan unit, or battery unit unless the Service Action Allowed status LED is turned on. Doing so can result in a potential loss of data availability. If the Needs Attention LED is lit and the associated Service Action Allowed status LED is not lit, then you must perform additional diagnostics before you can remove the indicated component. Use the Recovery Guru instructions in the DS4000 Storage Manager Subsystem Management window or refer to the appropriate component replacement instructions in this chapter for the additional diagnostics required in this case.
The Service Action Allowed status LED automatically turns on or off as conditions change. Wait at least two minutes after you replace each component for the controller to recognize the new component and update the LED status. In most cases when a single component fails, the Service Action Allowed status LED turns on steadily when the Needs Attention status LED is turned on for the component.
Replacing a controller
Attention: Before you replace a controller, verify the following:
vThe replacement controller part number matches the part number of the controller to be replaced. To provide full functionality, the two controllers should have the same cache memory capacity and FRU part number. Inserting a
Note: The DS4700 Express Storage Subsystem controller FRU is not compatible with the DS4200 Express Storage Subsystem controller FRU.
vBoth power supply and fan units must be connected and powered on with no Needs Attention LEDs lit. Ensure that the Power LEDs on each of the power supply and fan units are lit. If either of the power supply and fan units is not optimal, it is recommended that you replace that component before you proceed with the controller replacement procedure.
vIf you are replacing an optimal controller, first make sure that the other controller is optimal and that the fibre channel path from the hosts to the other controller is also optimal.
Each controller has a unique hardware Ethernet address, which is printed on a label on the front.
Use the following procedure to replace a controller in an DS4700 Express Storage Subsystem:
1.Use the DS4000 Storage Manager client software to print a storage subsystem profile. Move logical drive ownership to the other controller. If the controller you are replacing has failed but is still operating, move the failed controller to an Offline state.
Attention: Never remove a controller unless the Service Action Allowed status LED is turned on. Doing so can result in a potential loss of data.
2.Locate the failed controller by checking the Needs Attention status LEDs on the controllers in the storage subsystem.
3.Is the Service Action Allowed status LED turned on?
146IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide
