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98. Removing and replacing a failed controller CRU . . . . . . . . . . . . . . . . . . . 146
99. LEDs on the DS4500 Storage Subsystem bezel . . . . . . . . . . . . . . . . . . . 146
100. Removing and installing a battery unit . . . . . . . . . . . . . . . . . . . . . . 149
101. Recording the battery support information . . . . . . . . . . . . . . . . . . . . . 150
102. Removing and installing the storage subsystem fan . . . . . . . . . . . . . . . . . 152
103. Storage subsystem LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
104. Fan and communications module ports . . . . . . . . . . . . . . . . . . . . . . 154
105. Removing and installing a fan and communications module . . . . . . . . . . . . . . . 155
106. Power supply switch, AC power connectors, and indicator lights . . . . . . . . . . . . . 157
107. Removing and installing a power supply . . . . . . . . . . . . . . . . . . . . . . 158
108. Removing the fiber-optic cable from the SFP module . . . . . . . . . . . . . . . . . 159
109. Removing and installing a mini hub . . . . . . . . . . . . . . . . . . . . . . . 160
110. Replacing an SFP module . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
111. DS4500 Storage Subsystem parts listing . . . . . . . . . . . . . . . . . . . . . 165
112. Front rack mounting template . . . . . . . . . . . . . . . . . . . . . . . . . . 172
113. Rear rack mounting template . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Figures ix