Chapter 5. Replacing components
Replacing components
This chapter contains information about replacing components or installing optional devices in the
DCS3700 storage system and DCS3700 expansion unit.
Attention: To avoid overheating the storage enclosure and causing damage to its components, replace
failed parts within 10 minutes, unless otherwise indicated. The Recovery Guru in the Storage Manager
software identifies failed parts.
Do not remove the failed part from the storage enclosure until you:
v Review the replacement procedure for the failed part in this guide.
v Locate screw drivers or any other hand tools that you might need to replace the failed part.
v Receive the replacement part and are ready to install it in the enclosure.
Service Action Allowed LED
Each controller, ESM, fan assembly, disk drive, disk drive drawer, and power supply has a blue Service
Action Allowed LED. The purpose of the Service Action Allowed LED is to help ensure that a component
is not removed before it is safe to do so. Do not remove any component unless the component Service
Action Allowed LED is lit.
Attention
If you remove a controller, ESM, disk drive, disk drive drawer, or power supply when the Service Action
Allowed LED is not lit, a loss of data availability can result. If an amber LED is lit and the associated
Service Action Allowed LED is not lit, you must perform additional diagnostics before you can remove the
indicated component. Use the Recovery Guru instructions in the Subsystem Management window or see
the applicable component replacement instructions in this chapter for the additional diagnostics that are
required in this case.
The Service Action Allowed LED automatically turns on or off as conditions change. Wait at least 2
minutes after you replace a component for the storage subsystem to recognize the new component and
update the LED status. In most cases, when a single component fails, the Service Action Allowed LED
stays lit when the amber LED is lit for the component.
Working with controllers
This section describes how to remove a controller, remove and install a cover, install a controller, replace
a controller, and dispose of the system-board battery on the controller.
Attention: To avoid overheating the storage enclosure and causing damage to its components, replace
failed parts within 10 minutes. The Recovery Guru in the Storage Manager software identifies failed
parts.
Do not remove the failed part from the storage enclosure until you:
v Review the replacement procedure for the failed part in this guide.
v Locate screw drivers or any other hand tools that you might need to replace the failed part.
v Receive the replacement part and are ready to install it in the enclosure.
© Copyright IBM Corp. 2011 89
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