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scsi_maxphys(5)

Tunable Kernel Parameters
OBSOLETE
HP-UX 11i Version 3: February 2007
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NAME

scsi_maxphys — maximum allowed length of an I/O on all SCSI devices (OBSOLETE)

VALUES

Failsafe

1048576

Default

1024*1024

Allowed values

1048576

Recommended values

1048576

DESCRIPTION

Note: This tunable is obsolete. It is replaced by the escsi_maxphys attribute, which can be get and set using the scsimgr command (see scsimgr(1M)).

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.

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 has been obsoleted for HP-UX 11i Version 3.

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.

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