da(7)                          DG/UX R4.11MU05                         da(7)


NAME
       da - AViiON disk array subsystem (88K only)

SYNOPSIS
       da(parent-bus,unit-number)

DESCRIPTION
       The da disk array subsystem provides for disk array units configured
       on an AViiON High Availability Disk Array adapter, hada(7).

       Each da unit consists of an array (three or more disks), a disk
       mirror (two disks), or a single disk which must be associated with a
       particular adapter controller using the gridman(1M) utility, before
       it may be used.  This process is described in gridman(1M).

       To configure an da device, you must add a device name entry of the
       form described above to the DG/UX system configuration file.  The
       parameters in a device name have the following meanings:

       ·   The parent-bus parameter is itself a device name, representing
           the HADA device to which the device is attached (hada(vme(0),0)
           or hada(vme(1),3), for example).  There is no default value for
           this parameter; it must always be specified explicitly.

       ·   The unit-number parameter is a hexadecimal number in the range 6
           through 31 which represents the the array unit number assigned by
           gridman(1M).  There is no default value for this parameter; it
           must always be specified explicitly.

       The da driver provides no bad block remapping.  See the vdm(7) man
       page for details on how to set up a bad-block remap area using the
       Virtual Disk Manager.

FILES
       Each da device creates a single character-special device node when it
       is configured, with the pathname:

           /dev/rpdsk/da(parent-bus,unit-number)

       Each da device also creates a single block-special device node when
       it is configured, with the pathname:

           /dev/pdsk/da(parent-bus,unit-number)


       The chk.devlink command is responsible for creating and maintaining
       an additional "short-name" link to each such block-special and
       character-special device node.  See the chk.devlink(1M) and
       devlinktab(4M) man pages for details.

EXAMPLES
       The following entry in a DG/UX configuration file configures a disk
       array subsystem at unit 7 on the HADA bus named hada(vme(0),0):

            da(hada(vme(0),0),7)


SEE ALSO
       hada(7), gridman(7), dsk(7), rdsk(7), chk.devlink(1M),
       devlinktab(4M).


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