IBM Storwize V7000 Troubleshooting And Maintenance Manual page 112

Figure 29. Directions for lifting the handle on the power supply unit
Figure 30. Using the handle to remove a power supply unit
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Storwize V7000: Troubleshooting, Recovery, and Maintenance Guide
b. Grip the handle to pull the power supply out of the enclosure as shown in
Figure 30.
6. Insert the replacement power supply unit into the enclosure with the handle
pointing towards the center of the enclosure. Insert the unit in the same
orientation as the one that you removed.