Installation manual

14
Specified Target
Choices: 0 to 15 or 0 to 7 if Wide ID is disabled
Default: 0
Specifies the target ID to which settings are applied.
LUNs
Choices: Disable ID, 0, 0-7, 0-63
Default: 0-7
Specifies the number of LUNs which the driver addresses
when scanning for devices, determined as follows. This
setting is not available in Mac OS X.
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 if 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 Command Queuing
Choices: enabled, disabled
Default: enabled
Specifies to 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
ATTO Technical Support representative.
Sync Enabled for this ID
Choices: enabled, disabled
Default: enabled
Specifies whether the selected target transfers data at
synchronous transfer rates or at the asynchronous rate.
The maximum synchronous rate to negotiate is specified
in the Sync Rate parameter.
Sync Rate (MB/s)
Choices: varies by storage controller, see Exhibit 1.3-1
Default: varies by storage controller, see Exhibit 1.3-1
If synchronous transfers are enabled, the sync rate
specifies the maximum rate at which the ExpressPCI
storage controller negotiates with the selected target ID.
Set the rate to the maximum value supported by the
storage controller. If excessive SCSI errors occur, if you
have long cables or if there are many devices on the bus,
you may want to reduce the
Sync Rate value. Slowing
the transfer rate may increase the reliability of the SCSI
bus.
Wide Transfers
Choices: disabled, enabled
Default: enabled
Specifies if the initiator negotiates wide data transfers. If
the parameter is disabled, narrow data transfers are
negotiated. Wide Transfers is automatically set to
enabled when the
Sync Rate specifies a DT rate. The
DT sync rates must have wide data transfers.
Exhibit 1.3-1 Possible sync rates for various ATTO storage controllers.