IBM H SERIES RS/6000 - Manual (Page 89)

Hard Disk Spin Up Delay
This selection allows you to change the spin up delay for SCSI hard disk drives
attached to your system. Spin up delay values can be entered manually or a default
setting can be used. All values are measured in seconds. The default is two
seconds. After you have entered the new Spin up delay values, use the arrow keys
to highlight the Save icon and press the Enter key.
Chapter 4. System Management Services 4-15