sys_attrs_cam(5)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
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
Enables (1) the detection and use of only preferred paths to a
storage device that supports the T10 model. When disabled (0),
forces the use of all paths to that device.
Default: 1 (enabled)
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 docu‐
mentation.
A value that indicates how long to wait after the start of con‐
stant “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
setting change is global; that is, it overrides the default wait
interval for all disk drivers and is likely to cause unpre‐
dictable 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 inac‐
tive before spinning down the disk.
Default value: 30 (seconds)
Minimum value: 5
Maximum value: 65,535
cam_tape Subsystem Attributes
A value to disable preferred path behavior, in which the tape driver
assigns different paths to different tape drives. A value of 1 enables
preferred path behavior. A value of 0 disables it.
Default value: 0
Do not modify the default setting for this attribute unless
instructed to do so by support personnel or by patch kit docu‐
mentation.
Default value: 0
A value queried by the tape device driver to determine its ini‐
tialization 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 opera‐
tion. 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 ALSOsys_attrs(5)sys_attrs_cam(5)
