Dell PowerVault MD1120 Hardware Owner's Manual page 24

Figure 2-4. Single Host Server, Unified Mode (MD1120 and MD1000 Maximum
Expansion)
NOTE:
MD1120 and MD1000 enclosures cannot be attached in the same expansion
chain, or connected to the same host server controller.
4 Using the enclosure mode switch, select either unified or split mode (see
Figure 1-2 for switch positions).
5 Connect power to the power supplies.
NOTICE:
To safeguard your storage enclosure against power problems, connect
the AC power cable to a protected power supply, such as a UPS, line conditioner, or
surge protector. If possible, connect the two power supplies to different circuits.
6 Turn on the on/off switches on all power supply/cooling fan modules (see
Figure 1-7).
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Operating Your Storage Enclosure