Index for Section 5

Alphabetical listing for S

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_disk

    ·  cam_tape
  Refer to the sys_attrs(5) reference page for an introduction to the topic
  of kernel subsystem attributes.

  cam Subsystem Attributes


  Values of attributes for the CAM subsystem should never be modified.

  cam_disk Subsystem Attributes




  disk_bus_resp_time_enable
      A bit mask setting that enables or disables rapid device failure on
      error for SCSI disk drives that support tag queuing. Each bit in the
      bit mask corresponds to a particular bus slot; for example, bit 0
      corresponds to BUS 0, bit 1 corresponds to BUS 1, and so forth. Rapid
      device failure is disabled or enabled for the device identified by the
      bus number by setting the corresponding bit to 0 or 1, respectively.

      Default value: 0

      Minimum value: 0 (disable all)

      Maximum value: 0xffffffffffffffff (enable all)

      Enabling rapid device failure on error is useful when disks have
      Logical Storage Manager (LSM) mirror disk sets. Quick failure allows
      LSM to switch to the mirror disk when errors start to occur rather than
      when the disk fails.



  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.

      Default value: 10

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



  disk_dualcntr_no_resp_time
      This obsolete attribute exists only for backward compatibility.  It has
      no effect on systems running Tru64 UNIX Version 4.0E or higher
      versions.



  disk_no_response_time
      Number of seconds waited after the start of constant "no connection"
      errors for the disk device before starting recovery procedure.

      Default value: 14 (seconds)

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



  initialized
      Disk drive initialization state that must be set only by the subsystem.

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



  max_spinups_per_bus
      A value that is set only internally.

      Default value: 2

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



  pwrmgmt_poll_period
      Number of seconds that device polling reveals a drive is inactive
      before spinning down the disk.

      Default value: 50 (seconds)

      Minimum value: 5

      Maximum value: 0xffff

  cam_tape Subsystem Attributes




  fixed_block_padding
      Do not modify the default setting for this attribute unless instructed
      to do so by Compaq Computer Corporation 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)