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sys_attrs_cam(5)

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NAME    [Toc]    [Back]

       sys_attrs_cam,  sys_attrs_cam_disk,  sys_attrs_cam_tape  -
       SCSI CAM I/O subsystem attributes

DESCRIPTION    [Toc]    [Back]

       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.

SEE ALSO    [Toc]    [Back]

      
      
       sys_attrs(5)



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