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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 sub-
  system 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 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 inter-
  face.



  disk_busy_timeout
      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.



  disk_iob_aptpl
      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.



  disk_iob_console_key
      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.



  disk_iob_retry
      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.



  disk_no_response_time
      A	value that indicates how long to wait after the	start of constant "no
      connection" errors for the disk device before starting recovery pro-
      cedure. 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.



  disk_path_fail_limit
      Do not modify the	setting	for this attribute unless instructed to	do so
      by support personnel or by patch kit documentation.



  initialized
      Disk drive initialization	state, which is	set by the subsystem. This
      attribute	is query only.



  major_number_new
      A	query-only identifier that is set by the subsystem.



  major_number_old
      A	query-only identifier that is set by the subsystem.



  max_spinups_per_bus
      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)



  pwrmgmt_poll_period
      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




  fixed_block_padding
      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



  initialized
      A	value queried by the tape device driver	to determine its initializa-
      tion 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).



  open_behaviour
      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 ver-
      sions earlier than Version 4.0B and depend on the	open behavior in
      effect for those earlier versions.

SEE ALSO

  sys_attrs(5)