Content-type: text/html Man page of sys_attrs_cam

sys_attrs_cam

Section: File Formats (5)
Index Return to Main Contents
 

NAME

sys_attrs_cam, sys_attrs_cam_disk, sys_attrs_cam_tape - SCSI CAM I/O subsystem attributes  

DESCRIPTION

This reference page lists and describes attributes for the following kernel subsystems associated with the SCSI CAM I/O system: cam cam_disk cam_tape Refer to the sys_attrs(5) reference page for an introduction to the topic of kernel subsystem attributes.
 

cam Subsystem Attributes

Values of attributes for the CAM subsystem should never be modified.
 

cam_disk Subsystem Attributes

A bit mask setting that enables or disables rapid device failure on error for SCSI disk drives that support tag queuing. Each bit in the bit mask corresponds to a particular bus slot; for example, bit 0 corresponds to BUS 0, bit 1 corresponds to BUS 1, and so forth. Rapid device failure is disabled or enabled for the device identified by the bus number by setting the corresponding bit to 0 or 1, respectively.
Default value: 0
Minimum value: 0 (disable all)
Maximum value: 0xffffffffffffffff (enable all)
Enabling rapid device failure on error is useful when disks have Logical Storage Manager (LSM) mirror disk sets. Quick failure allows LSM to switch to the mirror disk when errors start to occur rather than when the disk fails.
Number of seconds that the subsystem waits in the presence of repeated device busy signals before performing a bus device reset operation on the device.
Default value: 10
Do not modify the default setting for this attribute unless instructed to do so by Compaq Computer Corporation support personnel or by patch kit documentation.
This obsolete attribute exists only for backward compatibility. It has no effect on systems running Tru64 UNIX Version 4.0E or higher versions.
Number of seconds waited after the start of constant ``no connection'' errors for the disk device before starting recovery procedure.
Default value: 14 (seconds)
Do not modify the default setting for this attribute unless instructed to do so by Compaq Computer Corporation support personnel or by patch kit documentation.
Disk drive initialization state that must be set only by the subsystem.
Do not modify the setting for this attribute unless instructed to do so by Compaq Computer Corporation support personnel or by patch kit documentation.
A value that is set only internally.
Default value: 2
Do not modify the default setting for this attribute unless instructed to do so by Compaq Computer Corporation support personnel or by patch kit documentation.
Number of seconds that device polling reveals a drive is inactive before spinning down the disk.
Default value: 50 (seconds)
Minimum value: 5
Maximum value: 0xffff
 

cam_tape Subsystem Attributes

Do not modify the default setting for this attribute unless instructed to do so by Compaq Computer Corporation support personnel or by patch kit documentation.
Default value: 0
A value queried by the tape device driver to determine its initialization state. You cannot modify this variable. The driver changes the value from 0 (when the system starts to boot) to 1 (during the boot operation).
A value that specifies the system behavior when a write-locked tape is opened with the O_RDWR or O_WRONLY flag. The default and recommended behavior (1) is to return failure on the open operation. The alternate behavior (0) is to allow the open operation but return failure on an attempt to write to the tape.
Default value: 1
It is recommended that you do not change the default. The 0 value is intended only for customers whose applications ran on DIGITAL UNIX versions earlier than Version 4.0B and depend on the open behavior in effect for those earlier versions.
 

SEE ALSO

sys_attrs(5)


 

Index

NAME
DESCRIPTION
cam Subsystem Attributes
cam_disk Subsystem Attributes
cam_tape Subsystem Attributes
SEE ALSO

This document was created by man2html, using the manual pages.
Time: 02:43:13 GMT, October 02, 2010