st(7)                      DG/UX 4.31                       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
          6677           QIC-320 320MB/525MB 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)[h|m|l][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, h|m|l 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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