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


NAME
       hada - VME High Availability Disk Array subsystem adapter (88K only)

SYNOPSIS
       hada(parent-bus[,controller-num])  or
       hada([controller-num])

DESCRIPTION
       The hada device driver allows an AViiON server to access a High
       Availability Disk Array (H.A.D.A.) system.  A hada adapter links a
       host's VME bus to group of Small Computer System Interface (SCSI)
       buses.  This adapter supports two basic device types: disk-array
       units, and general-purpose SCSI units.  Each disk-array unit may be
       composed of a disk array (three or more disks), a disk mirror (two
       disks), or a single disk.  They are accessible only through the disk
       array device driver, da(7), and must be associated with a particular
       controller using the gridman(1M) utility before they may be used.
       Refer to da(7) and gridman(1M) for more detail.

       An additional SCSI bus is used for general-purpose SCSI devices.
       This bus supports a maximum of six SCSI devices, whose SCSI IDs range
       from 0 to 5, inclusive.  Devices on this bus may be accessed using
       the DG/UX SCSI adapter interface described under "Writing a Device
       Driver" in Programming in the DG/UX Kernel Environment.  No special
       preparation with gridman(1M) is required before devices on this bus
       may be used.  They are permanently associated with unit numbers 0
       through 5.

       To configure such devices, you must add to the DG/UX system
       configuration file one or more device name entries of the forms
       described in the synopsis above.  The parameters in a device name
       have the following meanings:

       ·   The parent-bus parameter is itself a device name, representing
           the VME bus device to which the controller is attached (vme(0) or
           vme(1), for example).  In the second form of the device name,
           this parameter is omitted, a parent bus of vme(0) is assumed, and
           all subsequent parameters move up one position.  Thus, hada(3) is
           equivalent to hada(vme(0),3).  Note that only the second device
           name form is accepted when specifying a boot command string to
           the AViiON SCM.

       ·   The controller-num parameter is a hexadecimal number in the range
           0 through 3 which distinguishes the various standard addressing
           values to which the controller may be jumpered.  Consult the
           table below for details on these address settings.  The default
           value for controller-num is 0.

       Each hada controller board contains two jumperable VME board address
       settings:  the interrupt vector number used by the board, and the A16
       address of the board's 16-bit control register space.  The following
       hexadecimal address values are used for the 4 standard controller-num
       instances supported by the device driver on each parent VME bus:

                   Controller  Interrupt   A16 Address
                   Number      Vector
                               Number

                   0           70          FFFF1000
                   1           71          FFFF1400
                   2           72          FFFF1800
                   3           73          FFFF1C00


       A hada device can still be used even if it is not jumpered to one of
       the standard address settings.  However, such a device is referred to
       as a non-standard instance, and it requires a different device name
       format:

           hada@intr-vec-num(parent-bus,a16-addr)  or
           hada@intr-vec-num(a16-addr)


       The parameters in a non-standard device name have the following
       meanings:

       ·   The intr-vec-num value is the hexadecimal VME interrupt vector
           number used by the board.  There is no default value for this
           parameter; it must always be specified explicitly.

       ·   The parent-bus parameter has exactly the same meaning here as it
           does in the standard device name format.

       ·   The a16-addr parameter is the hexadecimal value of the VME A16
           address of the board's 16-bit control register space.  There is
           no default value for this parameter; it must always be specified
           explicitly.

EXAMPLES
       The following entry in a DG/UX configuration file configures all SCSI
       disk units on SCSI IDs 0 through 5 inclusive that are present on the
       third standard HADA controller on the first VME bus:

            sd(hada(vme(0),2),*)


       The following entry is a synonym for the example above:

            sd(hada(2),*)


       For more information about DG/UX device configuration, refer to
       "Writing a Device Driver" in Programming in the DG/UX Kernel
       Environment.

SEE ALSO
       scsi_bus(7), da(7), vme(7), gridman(1M).


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