IBM 2104 Model DU3 - Manual (Page 36)

Notes:
a. When the Drive Autostart switch 2 is set to On (the default setting), the
motors of the disk drive modules do not start until a Start Motor command
is issued. The timing sequence of startup is under the control of the
using-system software.
When the Drive Autostart switch 2 is set to Off, the disk drive modules are
set to Delay Motor Start mode.
The delay time before motor startup is specified by the disk drive modules.
After power is switched on, the delay time is usually SCSI ID x 12 seconds.
For example, the delay for a disk drive module whose SCSI ID is 2 is 2x12
seconds (24 seconds).
b. The Delay Motor Start Mode switch 5 selects either Delay Motor Start
Mode or Normal Start Mode when the Drive Autostart switch 2 is set to Off
.
When the Delay Motor Start Mode switch 5 is set to On, Delay Motor Start
mode is selected.
The delay time before motor startup is specified for each disk drive module.
After power is switched on, the delay time is usually SCSI ID x 12 seconds.
For example, the delay for a disk drive module whose SCSI ID is 2 is 2x12
seconds (24 seconds).
When the Delay Motor Start Mode switch 5 is set to Off, Normal Start
Mode is selected. Immediately after power is switched on, the motors of the
disk drive modules start.
8. Ensure that the Enable Enclosure Services switch 3 and the Select Enclosure
Services switch 4 are both set to On to allow ANSI SCSI-3 Enclosure
Services (SES) to operate. This applies to both AIX and Linux users. Your Linux
operating system may not support SES but the SES functions are used when
running the standalone AIX Diagnostics CD.
20 2104 Model DU3 Installation Guide
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