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sys_attrs_cam(5)
Contents
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sys_attrs_cam, sys_attrs_cam_disk, sys_attrs_cam_tape -
SCSI CAM I/O subsystem attributes
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 runtime
configuration should ever be done manually.
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 setting 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 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.
sys_attrs(5)
sys_attrs_cam(5)
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