Reconfigure Device Ids; Scsi Id Configuration Options - ATTO Technology R30F Installation And Operation Manual

Enable Wide IDs (8 - 15)
Choices: Enabled, Disabled
Default: Enabled
Allows you to access Wide devices that may reside at
these ID locations without affecting Wide data transfer
capability. This option is included for compatibility
with some older, 8-bit SCSI devices.
Video Tuner (Ultra3, Ultra/WIDE)
Choices: Enable, Disable
Default: Disabled
If you are not using a Radius capture board, keep at the
default (disabled) setting. Enable may increase capture
and playback performance for Radius users.
Selection Timeout
Choices: 1 ms - 1 sec
Default: 250 ms
Sets the amount of time a device has to respond to
being selected. You can lower this value to speed boot
process. If the value is lower than the recommended
250 milliseconds, it may be too fast and some devices
may not have enough time to respond.
Pre-4.3 SCSI Manager (Ultra3, Ultra/WIDE)
Choices: Enabled, Disabled
Default: Enabled
Allows support for pre-4.3 SCSI manager devices such
as older scanners and CD-ROMs. This setting does not
apply to the ExpressPCI Ultra 320 host adapter
because it is not compatible with pre-4.3 SCSI
manager devices
Fall Back Sync Rate
Choices: 1.8/3.6 MB/sec. - 20/40 MB/sec.
Default: 20 (Ultra/Narrow), 40 (Ultra/Wide)
Sets the maximum synchronous transfer rate on the
SCSI bus to account for the cabling and device
restrictions of Single-Ended UltraSCSI. You may set
the SCSI bus transfer rate to Fast/Wide SCSI transfer
rates to eliminate the cabling and device limitations of
UltraSCSI.
Quick Arbitrate & Select (Ultra320 only)
Choices: Disabled, Enabled
Default: Enabled
If enabled, Ultra320 QAS functionality is available.
This feature improves performance by reducing the
time required to process commands. QAS can only be
enabled if all target settings are set to Sync DT-IU

Reconfigure device IDs

You can configure a variety of settings for each
individual SCSI ID found on the ATTO SCSI bus. To
access all SCSI IDs, whether devices are attached or
not, use the device window menu to select busses and
all SCSI IDs.
Identify the SCSI ID you want to adjust under the
appropriate ATTO SCSI bus and double click on that
device or click its information button.

SCSI ID configuration options

WARNING Do not configure features unless you have a
thorough understanding of how they function or are
advised to change them by an ATTO Technical Support
representative.
Synchronous Transfers
Choices: Enabled, Disabled
Default: Enabled
Allows synchronous communication with devices.
Synchronous communication is generally faster than
asynchronous, but some devices may not function
efficiently in synchronous mode. Toggle this switch to
Disabled to initiate asynchronous data transfers.
Wide Transfers
Choices: Enabled, Disabled
Default: Enabled
Ultra3 Choice: Wide (default)
The ExpressPCI adapter tries to transfer SCSI data in
a Wide mode to all devices when enabled. It may be
disabled for older, Narrow devices that do not respond
properly to Wide transfer negotiation.
Allow Disconnect
Choices: Enable, Disable
Default: Enabled
Controls whether the ExpressPCI adapter allows the
device to use the SCSI disconnect/reconnect
mechanism. Allowing SCSI disconnects increases
performance in systems with a software-based array.
Allowing disconnect can increase the SCSI bus
overhead time, and decrease performance.
Enable LUNs
Choices: Disable ID, 0, 0-7, 0-63
Default: 0-63
Allows the use of Logical Unit Numbers (LUNs) for
this particular SCSI ID. IDs may be disables or set to
recognize a group of LUNs. For example, selecting
the 0-7 setting scans LUNs 0-7, while selecting the 0-
63 setting scans LUNs 0-63.
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