dkctl(1M)                      DG/UX R4.11MU05                     dkctl(1M)


NAME
       dkctl - control special disk operations

SYNOPSIS
       dkctl [-t] special [ option ]

   where:
       special
              Pathname of a DG/UX block or character special physical disk
              device
       option Option to enable or disable on the disk

DESCRIPTION
       The dkctl command is used, on SCSI disks, to enable or disable
       special disk options. In particular the enabling or disabling of
       verified writes (write check functionality) is controlled by this
       command.

       Options are:

       -t     Make the changes temporary.  The changes will not be preserved
              across system reboot.

       wchk   Enable write checking for the physical disk specified by
              special.  This means that all writes to the physical disk will
              be explicitly verified to have been correctly written on the
              disk.  Write verify can be used to enhance data integrity, but
              will result in degraded disk write performance.  This is the
              default state for physical disks using optical media.

       -wchk  Disable write checking for the physical disk specified by
              special.  This is the default state for all other physical
              disk devices.

EXAMPLES
       dkctl /dev/rpdsk/0 wchk
       dkctl /dev/pdsk/1 -wchk

FILES
       /etc/default/dkctl
                 Stores the default values for the dkctl parameters.  This
                 file is created after dkctl is executed the first time.

DIAGNOSTICS
       Exit status is 0 if successful, 1 if an error occurs.

SEE ALSO
       appropriateprivilege(5), sd(7).
       capdefaults(5).

NOTE
       Use of the dkctl command requires appropriate privilege.  For systems
       supporting the DG/UX Capability Option, appropriate privilege is
       defined as having one or more specific capabilities enabled in the
       effective capability set of the user.  See capdefaults(5) for the
       default capabilities for this command.

       On systems without the DG/UX Capability Option, appropriate privilege
       means that your process has an effective UID of root.  See the
       appropriateprivilege(5) man page for more information.


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