Adaptec AHA-2742T User Manual - Page 96

Performance Tips

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C Performance Tips Ther AHA-2740 Series is designed to maximize the performance of your SCSI devices and computer. The following tips will help you take full advantage of the host adapter's advanced design features. Enabling Synchronous Negotiation Synchronous negotiation is enabled (set to yes) by default on the AHA-2740 Series. You should normally enable this option on the host adapter because most SCSI devices support it and because it allows data to be transferred faster on the bus; however, because a few SCSI devices (e.g., certain CD-ROM drives) do not support synchronous negotiation and may malfunction if they receive a request for it, you may want to disable synchronous negotiation. See Configure BIOS and SCSI Device in Chapter 3. Note Even when synchronous negotiation is disabled on the host adapter, the host adapter will still switch to synchronous mode if it receives a request from the SCSI device. Disabling the Host Adapter BIOS Disabling the host adapter BIOS saves you 16 KBytes of memory address space and can also shorten boot-up time by as much as 60 seconds. See Configure the Host Adapter Parameters in Chapter 3. You should disable the host adapter BIOS if the peripherals on the SCSI bus (for example, CD-ROM drives) are all controlled by device drivers and do not require BIOS control. Adaptec AHA-2740 Series User's Manual Stock Number: 510381-00 / Rev. C (Page C-3) Print Spec Number: 491709-00 Rev C Current Date: 9/1/93 ECN Date: 9/14/93 C-3

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C
Performance Tips
Ther AHA-2740 Series is designed to maximize the performance
of your SCSI devices and computer. The following tips will help
you take full advantage of the host adapter’s advanced design
features.
Enabling Synchronous Negotiation
Synchronous negotiation is enabled (set to
yes
) by default on the
AHA-2740 Series. You should normally enable this option on the
host adapter because most SCSI devices support it and because it
allows data to be transferred faster on the bus; however, because
a few SCSI devices (e.g., certain CD-ROM drives) do not support
synchronous negotiation and may malfunction if they receive a
request for it, you may want to disable synchronous negotiation.
See
Configure BIOS and SCSI Device
in Chapter 3.
Note
Even when synchronous negotiation is disabled on the host
adapter, the host adapter will still switch to synchronous mode
if it receives a request from the SCSI device.
Disabling the Host Adapter BIOS
Disabling the host adapter BIOS saves you 16 KBytes of memory
address space and can also shorten boot-up time by as much as 60
seconds. See
Configure the Host Adapter Parameters
in Chapter
3.
You should disable the host adapter BIOS if the peripherals on
the SCSI bus (for example, CD-ROM drives) are all controlled by
device drivers and do not require BIOS control.
Adaptec AHA-2740 Series User’s Manual
Stock Number:
510381-00
/
Rev. C
(Page C-3)
Print Spec Number:
491709-00 Rev C
Current Date:
9/1/93
ECN Date:
9/14/93
C-3