IBM DU3 manual Using-system software

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.

202104 Model DU3 Installation Guide