HP PCIe U320 SCSI Host Bus Adapter - Manual (Page 28)

Fallback Sync
Rate (MB/s)
Choices: 40/20, 20/10, and 10/5
Default: 40/20
Specifies the maximum synchronous transfer rate to be negotiated when the
adapter detects a Single-Ended SCSI bus. The bus is Single-Ended when Ultra
SCSI devices are connected to the bus.
Bus Reset Delay
(sec)
Read only; no choices
Default: 3
The time delay between the reset of the SCSI bus and the scanning of the
SCSI bus. This is a read-only parameter.
Quick Arbitrate
& Select
Choices: Disabled, Enabled
Default: Enabled
If enabled, improves performance by reducing the time required to gain
control of the SCSI bus. QAS can only be enabled if all target settings are set
to Sync DT-IU and all devices on the bus support QAS.
LUNs Choices: Disable ID, 0, 0–7, 0–63
Default: 0–7
Specifies the number of LUNs that the driver addresses when scanning for
devices, determined as follows:
• Disable ID: Target ID is bypassed and not scanned
• 0: Scan LUN 0 for this target ID
• 0–7: Scan LUNs 0 to 7 for this target ID
• 0–63: Scan LUNs 0 to 63 for this target ID
Allow Disconnect Choices: Enabled, Disabled
Default: Enabled
Specifies whether a device is allowed to disconnect from the SCSI bus during
SCSI command processing. The device determines when it disconnects. This
setting does not force the device to disconnect.
Tagged Com-
mand Queuing
Choices: Enabled, Disabled
Default: Enabled
Specifies the driver if SCSI commands can use the Tag Command feature to
send multiple commands to a device.
Sync Offset Choices: 0–127
Default: 127
The defaults offer the best performance possible. The value should not be
changed unless instructed by an HP Support representative.
Sync Enabled for
this ID
Choices: Enabled, Disabled
Default: Enabled
Specifies whether the selected target transfers data as synchronous transfer
rates or at the asynchronous rate. The maximum synchronous rate to negotiate
is specified in the Sync Rate parameter.
28 Configuration tool