sys_attrs_cam man page on Tru64

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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 ALSO
       sys_attrs(5)

							      sys_attrs_cam(5)
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