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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 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.

  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
      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.

  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
      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).

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

SEE ALSO
  sys_attrs(5)

Index for Section 5

Alphabetical listing for S

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