Bull Cedoc Bull Escala 2104 TS4, Installation Manual

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4. Figure 22 shows the option switches. When the drive autostart switch-1
1
is
set to off, and the drive autostart switch-2
2
is set to on, the disk drive motors
do not start until you issue a START MOTOR command. The timing sequence
of the disk motor startup is under the control of the host system software.
When the drive autostart switch-1
1
is set to on, and the drive autostart
switch-2
2
is set to off, the disk drives are set to delay motor start mode. The
disk motor startup delay time is different for each disk drive, and is usually
computed by multiplying its SCSI ID by 12 seconds. For example, the disk drive
motor of a disk drive with a SCSI ID equal to 2 will start 24 ( 2 x 12) seconds
after power is applied to the 2104 Model TS4.
When the drive autostart switch-1
1
is set to off, and the drive autostart
switch-2
2
is set to off, the disk drives are set to normal start mode. The disk
drive motors will start when power is applied to the 2104 Model TS4.
The effect of both this switch and the drive autostart switch-2
2
being set to
on is undefined.
5. To set autostart switch-2
2
see step 4 for an explanation about the drive
autostart switch-1
1
.
6. 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.
Note: This applies to both AIX and Linux users. Your Linux operating system
might not support SES but the SES functions are used when running the
standalone AIX Diagnostics CD.
7. When the power control switch
5
is set to off, the 2104 Model TS4
automatically switches off or on when the host system is switched off or on.
When this switch is set to on, the 2104 Model TS4 is powered on or off by the
dc on/standby switch on a fan-and-power-supply assembly.
8. You already set the Box ID switch
6
in step 2 on page 9.
Figure 22. Setting the option switches
Installing and testing the 2104 Model TS4
11