IBM DS4800 - Service Action Allowed Status LED; Single Component Failures

v Do not leave the device where others can handle and possibly damage the
device.
v While the device is still in its static-protective package, touch it to an unpainted
metal part of the storage subsystem for at least two seconds. This drains static
electricity from the package and from your body.
v Remove the device from its package and install it directly into your storage
subsystem without setting it down. If it is necessary to set the device down, place
it in its static-protective package. Do not place the device on your storage
subsystem cover or any metal surface.
v Take additional care when handling devices during cold weather because heating
reduces indoor humidity and increases static electricity.
Service Action Allowed Status LED
Each controller, power supply-fan, and interconnect-battery unit has a blue Service
Action Allowed status LED. The purpose of the Service Action Allowed status LED
is to help ensure that a component is not removed before it is safe to do so. Do not
remove any DS4800 component unless the component’s Service Action Allowed
status LED is lit.
Attention
Never remove a controller, power supply-fan, or interconnect-battery unit
unless the Service Action Allowed status LED is turned on. Doing so can result
in a potential loss of data. 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.
The following sections discuss the behavior of the Service Action Allowed status
LED in cases of single and multiple component failures.
Single component failures
When a single component in the DS4800 has failed, the following list indicates the
behavior of the Service Action Allowed status LED lights:
v If a controller or power supply-fan fails and needs to be replaced, the amber
Needs Attention status LED on that component turns on to indicate that a service
action is required. If there are no data availability dependencies or other
conditions that dictate that the component should not be removed, the blue
Service Action Allowed status LED turns on. Do not remove any components
other than the component indicated by the lit blue Service Action Allowed status
LED.
v The interconnect-battery unit contains the mid-plane that communicates between
controllers A and B in the DS4800 Storage Subsystem. If the interconnect-battery
unit needs to be replaced, the Service Action Allowed status LED does not
134 IBM System Storage DS4800 Storage Subsystem: Installation, User’s, and Maintenance Guide