Adaptec AHA-2742T User Manual - Page 69

for the SCSI Start Unit Command

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AHA-2740 Series User's Manual Error if Device Not Found This option determines whether or not the host adapter BIOS generates an error message when the BIOS is unable to find the device during boot-up. When set to yes, the BIOS checks the SCSI ID for a SCSI device; if none is found, an error message is displayed during boot-up similar to the following: Channel A, Target #1 - Device Not Found When set to no, the BIOS does not attempt to display en error message if the SCSI device is not found. The default setting is no. Send Start Unit Command This option, which is supported by some SCSI devices, determines whether or not the SCSI Start Unit Command (SCSI command 1B) is sent to the SCSI device (most devices do not require this). The Start Unit Command reduces the load on your computer's power supply by allowing the host adapter to power-up SCSI devices one-at-a-time when you boot your system. Otherwise, the devices will all power-up at the same time. When set to yes, the SCSI Start Unit Command is sent to the SCSI device during boot-up. When set to no, the SCSI device will power-up in its normal fashion. The default setting is no. If this option is selected for more than one SCSI device, the SCSI device with the lowest SCSI ID will be sent the SCSI Start Unit Command first. When the first device is ready and responds to the host adapter, the next highest SCSI ID with a setting of yes is sent the SCSI Start Unit Command. This process continues until all supported devices respond to the host adapter. Note If many drives are set to yes for the SCSI Start Unit Command, system boot time will vary depending on how long each drive takes to spin-up. 3-18 Adaptec AHA-2740 Series User's Manual Stock Number: 510381-00 / Rev. C (Page 3-18) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93

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Error if Device Not Found
This option determines whether or not the host adapter BIOS
generates an error message when the BIOS is unable to find the
device during boot-up.
When set to
yes
, the BIOS checks the SCSI ID for a SCSI device;
if none is found, an error message is displayed during boot-up sim-
ilar to the following:
Channel A, Target #1 – Device Not Found
When set to
no
, the BIOS does not attempt to display en error
message if the SCSI device is not found. The default setting is
no
.
Send Start Unit Command
This option, which is supported by some SCSI devices, deter-
mines whether or not the SCSI Start Unit Command (SCSI com-
mand 1B) is sent to the SCSI device (most devices do not require
this). The Start Unit Command reduces the load on your comput-
er’s power supply by allowing the host adapter to power-up SCSI
devices one-at-a-time when you boot your system. Otherwise, the
devices will all power-up at the same time.
When set to
yes
, the SCSI Start Unit Command is sent to the
SCSI device during boot-up. When set to
no,
the SCSI device will
power-up in its normal fashion. The default setting is
no
.
If this option is selected for more than one SCSI device, the SCSI
device with the lowest SCSI ID will be sent the SCSI Start Unit
Command first. When the first device is ready and responds to
the host adapter, the next highest SCSI ID with a setting of
yes
is
sent the SCSI Start Unit Command. This process continues until
all supported devices respond to the host adapter.
Note
If many drives are set to
yes
for the SCSI Start Unit Command,
system boot time will vary depending on how long each drive
takes to spin-up.
Adaptec AHA-2740 Series User’s Manual
Stock Number:
510381-00
/
Rev. C
(Page 3-18)
Print Spec Number:
491709-00 Rev C
Current Date:
9/1/93
ECN Date:
9/14/93
AHA-2740 Series User’s Manual
3-18