04-23-2018
I haven't seen a physical SCSI device in eons. My understanding is SCSI doesn't scale well - to keep up with modern performance, it kept growing in cost and complexity compared to serial or network solutions, which pushed it out of many places it used to reign supreme. I know the concept is still used a lot in the abstract, even when the disks themselves aren't necessarily SCSI bus.
Last edited by Corona688; 04-23-2018 at 03:08 PM..
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AHB(4) BSD Kernel Interfaces Manual AHB(4)
NAME
ahb -- Adaptec EISA SCSI host adapter driver
SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file:
device scbus
device ahb
Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5):
ahb_load="YES"
DESCRIPTION
This driver provides access to the SCSI bus connected to an Adaptec AHA-174X host adapters in ``enhanced'' mode. Tagged queueing and syn-
chronous SCSI transfers are supported.
HARDWARE
The ahb driver supports the following SCSI host adapters:
o Adaptec AHA-1740
o Adaptec AHA-1742
o Adaptec AHA-1740A
o Adaptec AHA-1742A
CAVEATS
The Adaptec 174X is very sensitive to SCSI bus termination and cable length. It may also have difficulties operating with some modern
devices that, due to their speed, expose timing problems in the controller. There are no known mechanisms for working around device incom-
patibilities of this nature.
SEE ALSO
aha(4), ahc(4), aic(4), cd(4), da(4), sa(4), scsi(4)
AUTHORS
The ahb driver was written by Justin T. Gibbs.
BSD
July 4, 2004 BSD