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NAME
     xt - driver for Xylogics 472 1/2 inch tape controller

SYNOPSIS
     xt@2d,ee60:[l,m][b][n]

     xt@2d,ee68:[l,m][b][n]

DESCRIPTION
     The Xylogics 472 tape controller  controls  Pertec-interface
     1/2"  tape drives such as the Fujitsu M2444 and the CDC Key-
     stone III. The xt driver provides a standard tape  interface
     to the device; see mtio(7I) for details.

     The xt driver supports the character device  interface.  The
     driver  can  be  opened  with  either  rewind on close or no
     rewind on close options. The tape  format  and  options  are
     specified using the device name (see FILES below).

  EOT Handling
     The user will be notified of end of tape (EOT) on write by a
     0 byte count returned the first time this is attempted. This
     write must be retried by the user. Subsequent writes will be
     successful  until  the tape winds off the reel. Reading past
     EOT is transparent to the user.

IOCTL
     See mtio(7I) for a list of ioctls available  for  tape  dev-
     ices.   However,  not  all  devices  support all ioctls. The
     driver returns an  ENOTTY error on unsupported ioctls.

     1/2" tape devices do not support the  tape  retension  func-
     tion.

ERRORS
     EACCES
           The driver is opened for write access and the tape  is
           write protected.

     EBUSY The tape drive is in use by another process.  Only one
           process can use the tape drive at a time.

     EINVAL
           The requested number of bytes for a read operation  is
           less than the actual record length on the tape.

     EIO   During opening, the tape device is not  ready  because
           either  no  tape  is in the drive, or the drive is not
           on-line.  Once open, this error  is  returned  if  the
           requested I/O transfer could not be completed.

     ENOTTY
           This indicates that the tape device does  not  support
           the requested ioctl function.

     ENXIO During opening, the tape device does not exist.

FILES
          /kernel/drv/xt
                driver module

          /kernel/drv/xt.conf
                driver configuration file

          /dev/rmt/[0-1][l,m][b][n]
                raw devices


     For raw devices l,m specifies the density (low, medium), and
     b  the  optional  BSD  behavior  (see  mtio(7I))  and  n the
     optional  no  rewind  behavior.  For  example  /dev/rmt/0lbn
     specifies unit 0, low density, BSD behavior, and no rewind.

     For 1/2" reel tape devices, the densities are:

     l     typically 1600 BPI density

     m     typically 6250 BPI density

ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:

     ____________________________________________________________
   |        ATTRIBUTE TYPE       |        ATTRIBUTE VALUE      |
   | ____________________________|_____________________________|_
   |  Architecture               |  SPARC   (Sun-4/200,    Sun-|
   |                             |  4/300, and Sun-4/400 series|
   |                             |  only)                      |
   |_____________________________|_____________________________|


SEE ALSO
     ioctl(2), driver.conf(4), attributes(5), mtio(7I)

BUGS
     Record sizes are restricted to an even number of bytes.

     The EOT  handling  for  write  operation  differs  from  the
     mtio(7I) specification.

Партнёры:

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