Dell PowerVault 211S (SCSI) - Manual (Page 48)

5-4 Dell PowerVault 200S, 201S, 210S, and 211S Storage Systems Installation and Service Guide
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5. Connect the storage system power cable to the power supply and to an electrical
outlet.
To help safeguard your storage system from power problems, connect the AC
power cable to an uninterruptible power supply (UPS), line conditioner, or surge
protector. If your storage system includes an optional redundant power supply,
connect the two power supplies to different circuits, if possible.
NOTE: For the PowerVault 2xxS to power on, the PowerVault 2xxS must be
attached to a host adapter and the host server must be powered on.
1 Drive numbers
2 Enclosure status indicators
3 Keylock
4 SCSI ID numbers