Hitachi AMS 2100 Hardware Manual page 210

Set up spare drives
1. This screen shows the list of unused drives. Click the checkbox at the left
end of the row that describes the drive(s) you want to designate as
spare drives.
2. After making the selections, click Next> to open the Date & Time screen.
Set up date and time
The Set Up Date & Time page sets the real time clock (RTC) in the array.
The date and time information is used to timestamp logs and events in the
array.
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Configuration
Hitachi AMS 2100/2300 Storage System Hardware Guide