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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:
v The replacement controller part number matches the part number of the
v Both power supply and fan units must be connected and powered on with no
v If you are replacing an optimal controller, first make sure that the other controller
Use the following procedure to replace a controller in an DS4200 Express Storage
Subsystem.
Each controller has a unique hardware Ethernet address, which is printed on a label
on the front.
106
IBM System Storage DS4200 Express Storage Subsystem: Installation, User's and Maintenance Guide
Before you replace a controller, verify the following:
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 DS4200 Express chassis.
Note: The DS4200 Express Storage Subsystem controller FRU is not compatible
with the DS4700 Storage Subsystem controller FRUs.
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.
is optimal and that the fibre channel path from the hosts to the other controller is
also optimal.
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?
v Yes – Go to step 4.
v No – Another component might require attention before you can remove the
controller. Use the Recovery Guru function in the DS4200 Express
Subsystem Management window to identify and correct any additional
failures. If there are none, proceed with step 4 to replace the controller.
Electrostatic discharge can damage sensitive components. Touching the
storage subsystem or its components without using a proper ground might
damage the equipment. To avoid damage, use proper antistatic protection
while handling any components.
4. Put on antistatic protection.
5. Unpack the new controller. Save all packing materials in the event you need to
return the new controller.
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