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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:
v The 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
non-compatible controller causes the controller to be placed in a lockout state by
the other controller in the DS4700 Express chassis.
Note: The DS4700 Express Storage Subsystem controller FRU is not compatible
with the DS4200 Express Storage Subsystem controller FRU.
v Both 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.
v If 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?
146 IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide