NAME
scsi_maxphys — maximum allowed length of an I/O on all SCSI devices
VALUES
Allowed values
1048576
(16777215
and
33554432
for V-Class systems)
Recommended values
1048576
(16777215
for V-Class systems)
DESCRIPTION
This tunable sets the maximum data size the SCSI subsystem will accept for
an I/O.
Depending on the device's characteristics and the device driver
configuration, the maximum size allowed by the SCSI subsystem for a
particular SCSI device might be lower than or equal to this tunable's value.
It will never be greater.
Who Is Expected to Change This Tunable?
Any customer.
Restrictions on Changing
Changes to this tunable will take effect when the device is first opened.
When Should the Value of This Tunable Be Raised?
The value should never be raised except on V-Class systems where it can be
raised to 32 MB.
When Should the Value of This Tunable Be Lowered?
The value should never be lowered.
What Other Tunables Should Be Changed at the Same Time as This One?
None.
WARNINGS
All HP-UX kernel tunable parameters are release specific.
This parameter may be removed or have its meaning changed in
future releases of HP-UX.
Installation of optional kernel software, from HP or other vendors,
may cause changes to tunable parameter values. After installation,
some tunable parameters may no longer be at the default or
recommended values. For information about the effects of
installation on tunable values, consult the documentation
for the kernel software being installed.
For information about optional kernel software that was
factory installed on your system, see
HP-UX Release Notes
at
http://docs.hp.com.
AUTHOR
scsi_maxphys
was developed by HP.
