IBM TotalStorage DS4000 EXP700 Installation, User's, And Maintenance Manual page 98

2. After you check the storage expansion enclosure for damage, ensure that the
3. Check the system documentation of the hardware devices that you want to turn
4. Turn on the power to each device, based on the startup sequence.
5. Turn on both of the power supply switches on the storage expansion enclosure.
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IBM TotalStorage DS4000 EXP700 and EXP710 Storage Expansion Enclosures: Installation, User's, and Maintenance Guide
power switches are in the off position; then plug in the storage expansion
enclosure power cables.
on and determine the proper startup sequence.
Note: Turn on the storage expansion enclosure before or at the same time as
the controller.
The green LEDs on the front and the back of the storage expansion enclosure
should remain lit. If other amber Fault LEDs are lit, see Chapter 4, "Hardware
maintenance," on page 77.