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SCSI Device Settings
The SCSI device settings allow you to configure certain
parameters for each device on the SCSI bus. To configure
settings for a specific device, you must know the SCSI ID
assigned to that device. If you are not sure of the SCSI ID,
see Using the SCSI Disk Utilities on page 9.
■
Initiate Sync Negotiation
—This option determines
whether synchronous data transfer negotiation (Sync
Negotiation) between the device and host adapter is
initiated by the host adapter. Normally, the Initiate
Sync Negotiation setting should be enabled, because
most SCSI devices support synchronous negotiation
and because it allows for faster data transfer.
■
Maximum Sync Transfer Rate
—This option sets the
maximum synchronous data transfer rate that the
host adapter supports. The host adapter supports
rates up to the Fast SCSI maximum of 10.0 MBytes/
sec. In most cases, you can use the maximum value of
10.0.
■
Enable Disconnection
—This option determines
whether the host adapter allows the SCSI device to
disconnect from the SCSI bus (sometimes called
Disconnect/Reconnect). If you have only one device
on the SCSI bus, disabling disconnection will give a
slight performance increase. If you have more than
one device on the SCSI bus, disconnection should be
enabled to allow multithreaded SCSI operation.
■
Send Start Unit Command
—This option determines
whether the Start Unit Command is sent to the SCSI
device at bootup. Most devices do not require this,
but check your device’s documentation.
Advanced Host Adapter Settings
The advanced host adapter settings should not be
changed unless absolutely necessary.
■
ISA Plug and Play Support
—This option determines
whether the host adapter supports Plug and Play
functionality. When Plug and Play Support is
enabled, the host adapter will work fine in both Plug
and Play and Legacy (non-Plug and Play) systems.
The only time you should disable Plug and Play Sup-
port is when you have an “ill-behaved” Plug and
Play system. If you cannot get your host adapter
working in a Plug and Play system, as a last resort,
try disabling this setting.
■
Plug and Play SCAM Support
—This option deter-
mines whether the host adapter automatically assigns
SCSI IDs to SCSI devices that support the SCAM pro-
tocol (see Using Your Host Adapter on page 6). Most
non-SCAM devices tolerate the SCAM protocol, so
you can enable this option even if you have a non-
SCAM device.
■
Host Adapter BIOS
—This option enables or disables
the host adapter BIOS functionality. Unlike the DIP
switch BIOS PROM Disabled setting, when you dis-
able the Host Adapter BIOS with SCSISelect, you still
have access to SCSISelect. If you are booting from a
SCSI disk drive connected to the host adapter, the
BIOS must be enabled.
Several SCSISelect options are not valid unless the
host adapter BIOS is enabled. The table on page 8
identifies these options. 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 need the BIOS.
■
Support Removable Disks Under BIOS as Fixed
Disks
—This option controls which removable-media
drives are supported by the host adapter BIOS. The
following choices are available:
–
Boot Only
—Only the removable-media drive
designated as the boot device is treated as a hard
disk drive.
–
All Disks
—All removable-media drives sup-
ported by the BIOS are treated as hard disk drives.
–
Disabled
— No removable-media drives are
treated as hard disk drives. In this situation, soft-
ware drivers are needed because the drives are
not controlled by the BIOS.
Caution:
If a removable-media SCSI device is
controlled by the host adapter BIOS, do not
remove the media while the drive is on or you
may lose data! If you want to be able to remove
media while the drive is on, install the remov-
able-media device driver and set this option to
Disabled
.
