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Restoring power after an unexpected shutdown ...........137
Recovering from an overheated power supply and fan unit ........138
Cache memory and cache battery .................140
Cache memory .......................141
Subsystem cache battery ...................142
Chapter 5. Replacing components ................145
Handling static-sensitive devices ..................145
Service Action Allowed Status LED .................145
Replacing a controller ......................146
Removing and replacing a bezel ..................150
Replacing a filter and filter retainer .................151
Working with hot-swap E-DDMs ..................151
Installing hot-swap E-DDMs...................153
Replacing hot-swap E-DDMs ..................155
Replacing multiple E-DDMs ...................156
Replacing all E-DDMs at the same time .............157
Replacing the E-DDMs one at a time ..............159
Verifying the Link Rate setting ..................161
Replacing an ac power supply and fan unit ..............164
Replacing a dc power supply and fan unit ..............169
Replacing a battery unit .....................175
Replacing an SFP module ....................177
Replacing a midplane ......................178
Chapter 6. Hardware maintenance ................183
General checkout .......................183
Solving problems .......................183
Parts listing..........................188
Appendix A. Records .....................191
Identification numbers ......................191
Storage subsystem and controller information record ..........192
Sample information record ...................193
Installed device records .....................194
Appendix B. Rack mounting template ...............195
Appendix C. Power cords ....................199
Appendix D. Additional DS4000 documentation ...........203
DS4000 Storage Manager Version 10 library .............203
DS4800 Storage Subsystem library .................204
DS4700 Storage Subsystem library .................205
DS4500 Storage Subsystem library .................206
DS4400 Storage Subsystem library .................207
DS4300 Storage Subsystem library .................208
DS4200 Express Storage Subsystem library .............209
DS4100 Storage Subsystem library .................210
DS4000 Storage Expansion Enclosure documents ...........211
Other DS4000 and DS4000-related documents ............212
Appendix E. Accessibility ....................213
Notices ...........................215
Trademarks..........................215
vi IBM System Storage DS4700 Express Storage Subsystem: Installation, User’s and Maintenance Guide