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dda(7D)				    Devices			       dda(7D)

NAME
       dda - MMS disk archiving driver

SYNOPSIS
       /devices/pseudo/dda@lun:bn

DESCRIPTION
       The Media Management System (MMS) is a distributed removable media man‐
       agement system based on the IEEE 1244 Media Management System  specifi‐
       cation.	MMS provides a uniform and consistent tape interface to client
       applications.

       The dda driver is a pseudo tape drive with filesystem file  media.  The
       dda  driver  is	a minimal emulation of the st(7D) tape driver mtio(7I)
       interface with BSD no-rewind behavior and is used for MMS disk  archiv‐
       ing. The dda driver should be used with a MMS MMP mount command handle.
       You configure DDA tapes, drives, and libraries for disk archiving using
       the  mmsadm(1M)	command.  You also use mmsadm(1M) to mount and unmount
       dda media.

CONFIGURATION
       To set the number of disk archiving tape drives available for MMS  disk
       archiving,   edit  the  /kernel/drv/dda.conf  configuration  file.  The
       default number of disk archiving tape drives is 20.

       The disk archiving tape drive devlinks  are  located  in	 the  /dev/dda
       directory.

       The DDA maximum block size is 262144 bytes and the minimum is 1 byte.

FILES
       /kernel/drv/dda		  32-bit kernel module (x86)

       /kernel/drv/sparcv9/dda	  64-bit kernel module (SPARC)

       /kernel/drv/amd64/dda	  64-bit kernel module (x86)

       /kernel/drv/dda.conf	  dda configuration file

ATTRIBUTES
       See attributes(5) for a description of the following attributes:

       ┌────────────────────┬─────────────────────────────────────────────────────────┐
       │  ATTRIBUTE TYPE    │			  ATTRIBUTE VALUE		      │
       ├────────────────────┼─────────────────────────────────────────────────────────┤
       │Architecture	    │ SPARC, x86					      │
       ├────────────────────┼─────────────────────────────────────────────────────────┤
       │Availability	    │ system/storage/mms				      │
       ├────────────────────┼─────────────────────────────────────────────────────────┤
       │Interface Stability │ Uncommitted					      │
       └────────────────────┴─────────────────────────────────────────────────────────┘

SEE ALSO
       mt(1), mmsadm(1M), attributes(5), dmd(7D), st(7D), mtio(7I)

       IEEE 1244 Removable Media Standards Specification — IEEE, 2000

SunOS 5.11			  17 Oct 2008			       dda(7D)

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