Avago Technologies LSI20160 User Manual
Page 175
Using Command Line Options
7-15
Copyright © 1993–2001 by LSI Logic Corporation. All rights reserved.
/DISCONNECT
or
/DC
Allows (or does not allow) a device to disconnect during an I/O transfer. SCSI
devices have the ability to disconnect from the bus during an I/O transfer. If a
particular adapter has parity checking disabled, then you must use this option to
disable disconnects for all devices on that adapter that do not generate parity.
Refer to the
/PARITY
option for more information.
Syntax:
/DISCONNECT = n
where: n =
ON
is the default value for all devices, which allows disconnects and
OFF
does not allow disconnects.
To disable disconnects on the device at ID 2 on host adapter 0, the line in the
CONFIG.SYS
file that loads
SYM8XX.ADD
should look like this:
BASEDEV=SYM8XX.ADD /DISCONNECT=OFF<0:2>
or
BASEDEV=SYM8XX.ADD /DC=OFF<0:2>
/PARITY
or
/P
Allows enabling or disabling SCSI bus data integrity checking, known as parity.
Use this option to disable parity checking. The LSI Logic chips are capable of
enabling or disabling parity. Some non-SCSI compliant devices sold as SCSI
devices do not generate parity. The LSI Logic chips always generate parity (for
outputs), but may optionally check the parity (for inputs).
Note: When disabling parity checking, you must disable disconnects for any
device that does not generate parity, as the LSI Logic chips cannot disable parity
checking for that device during the reselection phase. If a device does not
generate parity and it disconnects, the I/O never completes. Refer to the
/DISCONNECT
option for more information about disabling disconnects for a
device.
Syntax:
/PARITY = n
where: n =
ON
is the default value for all devices, which enables parity checking.
OFF
disables parity checking.
To turn off parity checking on host adapter number 0, the line in the
CONFIG.SYS
file that loads
SYM8XX.ADD
should look like this:
BASEDEV=SYM8XX.ADD /PARITY=OFF<0>
or
BASEDEV=SYM8XX.ADD /P=OFF<0>
Table 7.1
OS/2 Command Line Options (Cont.)
Option Name
Description