IBM DCS9550 1S1 manual Dealing with Hardware Faults, Continuous Operation During Replacement

Troubleshooting and Problem Solving

4.6.1Dummy Carrier Modules

Dummy Carrier modules must be fitted to all unused drive bays to maintain a balanced air flow.

4.7Dealing with Hardware Faults

Ensure that you have obtained a replacement module of the same type before removing any faulty module.

ATTENTION If the DCS9550 1S1 Storage Expansion Unit is powered up and you remove any module, replace it immediately. If the subsystem is used with modules or module blanks missing for more than a few minutes, the Enclosure can overheat, causing power failure and data loss. Such use will invalidate the warranty.

•Replace a faulty drive with a drive of the same type and equal or greater capacity.

•All drive bays must be fitted with a Drive Carrier module or a dummy carrier module in order to maintain a balanced air flow.

•All the supplied plug-in power supply units, electronics modules and blank modules must be in place for the air to flow correctly around the cabinet.

4.8Continuous Operation During Replacement

Depending on how the subsystem is set up, if a disk unit fails, it can normally be replaced without interrupting the use of the system.

In addition, each enclosure contains two Power Supply/Cooling modules, either of which can maintain power and cooling to the subsystem while the other is replaced.

4.9Replacing a Module

ATTENTION Whenever replacing a module NEVER leave an EMPTY bay in the rear of the enclosure, obtain a replacement before removing the problem part.

Please refer to 2 , ”Installation” for information on the initial installation of the plug-in modules in the DCS9550 1S1 Storage Expansion Unit.

Caution Observe all conventional ESD precautions when handling the DCS9550 1S1 Storage Expansion Unit modules and components. Avoid contact with Backplane components and module connectors, etc.

IBM System Storage DCS9550 1S1 Storage Expansion Unit Installation, Service, and User Guide 45