st(7)                      DG/UX 4.30                       st(7)



     NAME
          st - AViiON family tape subsystem

     DESCRIPTION
          The st tape subsystem provides support for tape drives
          compatible with the Small Computer Systems Interface (SCSI).
          The models supported are as follows:

          Model #          Description
          6577             QIC-150 150MB 1/4" cartridge
          6586-A, 6587-A   1600 bpi 1/2" autoload streaming reel-to-reel
          6588-A           1600/6250 bpi 1/2" autoload streaming reel-to-reel
          6588-TA          800/1600/6250 bpi 1/2" autoload streaming reel-to-reel
          6590             8mm 2GB helical scan

          A tape unit may be accessed directly via the special file
          nodes in /dev/rmt.  These nodes are named in the form:

          /dev/rmt/st(<adap>@<c>(<addr>),<i>,<d>)[hml][n]

          where <adap> is the name of the controller, <c> is the
          device code, <addr> is the address of the adapter, <i> is
          the SCSI ID number, <d> is the unit number, [hml] specifies
          high (h), medium (m), or low (l) tape density for those
          models on which density selection is supported, and [n]
          specifies that the tape unit does not automatically rewind
          to Beginning-of-Tape (BOT) when closed.  The nodes in
          /dev/rmt provide access as a character special device as
          described in rmt(7).

          When accessed via the nodes in /dev/rmt, the maximum record
          size is 32,768 bytes for all models listed above. Model 6577
          supports only fixed-length physical records of 512 bytes,
          while the other models support variable-length physical
          records.  For this reason, I/O to model 6577 must be done in
          multiples of 512 bytes.  Otherwise, the I/O will fail with
          an errno of EINVAL.

     FILES
          /dev/rmt/*

     SEE ALSO
          rmt(7), insc(7), cisc(7).












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