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SCSI(4)								       SCSI(4)

Name
       SCSI - Small Computer System Interconnect

Syntax
       xx##

Description
       The ULTRIX system interfaces to disk and tape devices through the Small
       Computer System Interconnect (SCSI).  Initial ULTRIX  SCSI  support  is
       limited	to  the	 Digital-supplied mass storage devices.	 The following
       devices are fully supported on the ULTRIX system:

       ·    Winchester disks: RZ22, RZ23, RZ23L, RZ24, RZ25, RZ55, RZ56, RZ57,
	    RX23, RX26, RX33

       ·    Magnetic tapes: TZ30, TZK50, TLZ04, TSZ05, TKZ08, TZK10

       ·    Optical disks: RRD40, RRD42

       Under  the ULTRIX operating system, a SCSI device is referred to by its
       logical name.  Logical names take the following form: xx## The  logical
       name consists of a two-character name and a unit number.	 The two-char‐
       acter names for SCSI devices are:

       rz  -  RZ22, RZ23, RZ23L, RZ24, RZ25, RZ55,  RZ56,  RZ57,  RX23,	 RX26,
	   RX33, RRD40, RRD42 disks

       tz  -  TZ30, TZK50, TLZ04, TSZ05, TKZ08, and TZK10 tapes

       The  unit  number is a combination of the SCSI bus number, either 0, 1,
       ... and the device's target ID number.  The unit number is eight	 times
       the bus number plus the target ID.  For example, an RZ23 disk at target
       ID 3 on bus 0 would be referred to as rz3; a TZK50 tape at target ID  5
       on the second SCSI bus would be referred to as rz13.

       The  SCSI bus has eight possible target device IDs.  By default, one is
       allocated to the system.	 This allows for a  maximum  of	 seven	target
       devices connected to a SCSI bus.

Restrictions
       Devices on the KZQSA interface cannot be used as boot devices.

       The  ULTRIX  SCSI  device  driver  does not operate with optical disks,
       other than the Digital-supplied devices.

       The SCSI driver attempts to support on a best effort  basis,  non-Digi‐
       tal-supplied winchester disks and magnetic tapes.

       The  following notes apply to the driver's handling of non-Digital-sup‐
       plied disks:

       ·   These disks are assigned a device type of RZxx, instead of Digital-
	   supplied  disk  names listed above.	The RZxx disks follow the same
	   logical device naming scheme as the Digital-supplied disks.

       ·   During the autoconfigure phase of the system	 startup,  the	driver
	   prints  the	contents  of  the  SCSI vendor ID, product ID, and the
	   revision level fields of  the  inquiry  data	 return	 by  the  SCSI
	   device.

       ·   RZxx	 disks are assigned a default partition table. The default ta‐
	   ble can be modified by editing the sz_rzxx_sizes[8]	entry  in  the
	   file	 The utility can also be used to modify the partition table on
	   a RZxx disk.

       ·   The only logical unit number (LUN) supported for each target ID  is
	   0.

Device Support
       Consult	the  ULTRIX  Software  Product	Description to determine which
       drives are supported for different CPU types  and  hardware  configura‐
       tions.

See Also
       rz(4), tz(4), chpt(8)

								       SCSI(4)

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