sys_attrs_cam(5) File Formats Manual sys_attrs_cam(5)
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_adapter-id cam_disk cam_tape
An asterisk (*) precedes the name of an attribute that is modifiable at run time. However, the ability to modify the value at run-time may
be a software requirement. Read the attribute description carefully to determine whether run-time configuration should ever be done manu-
ally.
Refer to the sys_attrs(5) reference page for an introduction to the topic of kernel subsystem attributes.
cam and Adapter-Specific Cam Subsystem Attributes
Values of attributes for the CAM (cam) subsystem and adapter-specific (cam_adapter-id) CAM subsystems should never be modified.
cam_disk Subsystem Attributes
Attributes for the cam_disk subsystem should be changed internally or under the direction of support personnel. Most of these attributes
have a global effect across all disk devices. If the affected devices are of the same type, a global change may be appropriate. However,
global changes applied to devices with different requirements is likely to adversely affect some of the devices. The Hardware Manager
application allows you to apply device-specific adjustments and it is recommended that you use this interface.
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.
Do not modify the setting for this attribute unless instructed to do so by support personnel or by patch kit documentation.
This attribute has effect only in a TruCluster environment.
Do not modify the setting for this attribute unless instructed to do so by support personnel or by patch kit documentation.
This attribute has effect only in a TruCluster environment.
Do not modify the setting for this attribute unless instructed to do so by support personnel or by patch kit documentation.
This attribute has effect only in a TruCluster environment.
Do not modify the default setting for this attribute unless instructed to do so by support personnel or by patch kit documentation.
A value that indicates how long to wait after the start of constant "no connection" errors for the disk device before starting
recovery procedure. The default value indicates that all bits are set to 1. This specifies that disk driver defaults for this wait
interval are applied.
Do not modify the setting for this attribute unless instructed to do so by support personnel or by patch kit documentation. A set-
ting change is global; that is, it overrides the default wait interval for all disk drivers and is likely to cause unpredictable
behavior in some devices.
Do not modify the setting for this attribute unless instructed to do so by support personnel or by patch kit documentation.
Disk drive initialization state, which is set by the subsystem. This attribute is query only.
A query-only identifier that is set by the subsystem.
A query-only identifier that is set by the subsystem.
Do not modify the setting for this attribute unless instructed to do so by support personnel or by patch kit documentation.
Default value: 2 (spinups)
Number of seconds that device polling reveals a drive is inactive before spinning down the disk.
Default value: 30 (seconds)
Minimum value: 5
Maximum value: 65,535
cam_tape Subsystem Attributes
Do not modify the default setting for this attribute unless instructed to do so by 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 rec-
ommended 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)
sys_attrs_cam(5)