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scsi(4)				 File Formats			       scsi(4)

NAME
       scsi - configuration files for SCSI target drivers

DESCRIPTION
       The  architecture of the Solaris SCSI subsystem distinguishes two types
       of device drivers: SCSI target drivers, and SCSI host adapter  drivers.
       Target  drivers	like  sd(7D) and st(7D) manage the device on the other
       end of the SCSI bus. Host adapter drivers manage the SCSI bus on behalf
       of all the devices that share it.

       Drivers for host adapters provide a common set of interfaces for target
       drivers. These interfaces comprise the Sun Common SCSI  Architecture  (
       SCSA)  which  are  documented  as  part	of  the	 Solaris  DDI/DKI. See
       scsi_ifgetcap(9F), scsi_init_pkt(9F), and scsi_transport(9F)  for  fur‐
       ther details of these, and associated routines.

       Depending  on  the  interconnect	 (transport),  SCSI target devices are
       either self-identifying or rely on driver.conf(4) entries to be	recog‐
       nized  by  the  system.	For self-identifying target devices the driver
       binding is chosen based on the IEEE-1275 like 'compatible' forms of the
       target  devices.	 Currently  the	 Fibre Channel interconnects, fcp(7D),
       ifp(7D), scsi_vhci(7D), sf(7D), and the	SATA  framework	 drivers  (see
       sata(7D))  are self-identifying. You must specify other possible inter‐
       connects target devices by using the target driver driver.conf(4)  con‐
       figuration files.

   Self-Identifying
       Host  adapter  drivers  of class scsi-self-identifying that dynamically
       create self-identifying target device children establish	 a  compatible
       property	 on each child. The compatible property is an ordered array of
       strings, each string is a compatible form. High	precedence  forms  are
       defined	first.	For  a	particular device, the highest precedence form
       that has an established driver alias selects the driver for the device.
       Driver  associations  to compatible forms, called aliases, are adminis‐
       tered by way of add_drv(1M), update_drv(1M), and rem_drv(1M) utilities.

       The forms for self-identifying SCSI target devices are derived from the
       SCSI  target  device's INQUIRY data. A diverse set of forms is defined,
       allowing for flexibility in binding.

       From the SCSI INQUIRY data, three types of information  are  extracted:
       scsi_dtype, flag bits, and SCSI_ASCII vendor product revision.

       The  scsi_dtype is the first component of most forms. It is represented
       as two hex digits. For nodes that represent  embedded  secondary	 func‐
       tions,  such  as	 an embedded enclosure service or media changer, addi‐
       tional forms are generated that contain	the  dtype  of	the  secondary
       function	 followed  by  the  dtype of the device in which the secondary
       function is embedded.

       For forms that use flag bits, all applicable flags are concatenated (in
       alphabetical order) into a single flags string. Removable media is rep‐
       resented by a flag. For forms that use the SCSI_ASCII  INQUIRY  vendor,
       product, and revision fields, a one-way conversion algorithm translates
       SCSI_ASCII to a IEEE 1275 compatible string.

       It is possible that a device might change the INQUIRY data  it  returns
       over  time  as  a  result  of  a	 device	 initialization sequence or in
       response to out-of-band management. A device node's compatible property
       is based on the INQUIRY data when the device node was created.

       The  following  forms, in high to low precedence order, are defined for
       SCSI target device nodes.

	 scsiclass,DDEEFFF.vVVVVVVVV.pPPPPPPPPPPPPPPPP.rRRRR (1	 *1&2)
	 scsiclass,DDEE.vVVVVVVVV.pPPPPPPPPPPPPPPPP.rRRRR    (2	 *1)
	 scsiclass,DDFFF.vVVVVVVVV.pPPPPPPPPPPPPPPPP.rRRRR   (3	 *2)
	 scsiclass,DD.vVVVVVVVV.pPPPPPPPPPPPPPPPP.rRRRR	     (4)
	 scsiclass,DDEEFFF.vVVVVVVVV.pPPPPPPPPPPPPPPPP	     (5	 *1&2)
	 scsiclass,DDEE.vVVVVVVVV.pPPPPPPPPPPPPPPPP	     (6	 *1)
	 scsiclass,DDFFF.vVVVVVVVV.pPPPPPPPPPPPPPPPP	     (7	 *2)
	 scsiclass,DD.vVVVVVVVV.pPPPPPPPPPPPPPPPP	     (8)
	 scsiclass,DDEEFFF				     (9 *1&2)
	 scsiclass,DDEE					     (10 *1)
	 scsiclass,DDFFF				     (11 *2)
	 scsiclass,DD					     (12)
	 scsiclass					     (13)
	    *1 only produced on a secondary function node
	    *2 only produced on a node with flags

       where:

       v		   Is the letter v. Denotes the beginning of VVVVVVVV.

       VVVVVVVV		   Translated scsi_vendor: SCSI standard INQUIRY  data
			   "Vendor  identification"  SCSI_ASCII	 field	(bytes
			   8-15).

       p		   Is  the  letter  p.	Denotes	  the	beginning   of
			   PPPPPPPPPPPPPPPP.

       PPPPPPPPPPPPPPPP	   Translated scsi_product: SCSI standard INQUIRY data
			   "Product identification"  SCSI_ASCII	 field	(bytes
			   16-31).

       r		   Is the letter r. Denotes the beginning of RRRR.

       RRRR		   Translated  scsi_revision:  SCSI  standard  INQUIRY
			   data	 "Product  revision  level"  SCSI_ASCII	 field
			   (bytes 32-35).

       DD		   Is  a two digit ASCII hexadecimal number. The value
			   of the two digits is based one the SCSI "Peripheral
			   device  type" command set associated with the node.
			   On a primary node this is  the  scsi_dtype  of  the
			   primary  command  set;  on a secondary node this is
			   the scsi_dtype associated with the  embedded	 func‐
			   tion command set.

       EE		   Same encoding used for DD. This form is only gener‐
			   ated on secondary function nodes. The  DD  function
			   is embedded in an EE device.

       FFF		   Concatenation,  in  alphabetical order, of the flag
			   characters below. The following flag characters are
			   defined:

			   R	Removable media: Used when scsi_rmb is set

			   Forms  using FFF are only be generated if there are
			   applicable flag characters.

       Solaris might create additional compatible forms not  described.	 These
       forms  are  for	Solaris internal use only. Any additional use of these
       forms is discouraged. Future releases  of  Solaris  might  not  produce
       these forms.

   driver.conf
       Configuration  files  for  SCSI target drivers should identify the host
       adapter driver implicitly using the class keyword to remove any	depen‐
       dency on the particular host adapter involved.

       All  host adapter drivers of class scsi recognize the following proper‐
       ties:

       target	 Integer-valued	 SCSI  target  identifier  that	 this	driver
		 claims.

       lun	 Integer-valued	 SCSI  logical	unit  number  ( LUN) that this
		 driver claims.

       All SCSI target driver configuration  file  device  definitions	except
       stub  device definitions for discovery of devid must provide target and
       lun properties. These properties are used to construct the address part
       of the device name under /devices. The stub device definitions for dis‐
       covery of devid must be able to specify or imply the host adapter driv‐
       ers  that  might	 have  children that bind to the target driver. So all
       SCSI target driver configuration file stub device definitions  must  be
       defined by property class or parent.

       The  SCSI  target  driver configuration files shipped with Solaris have
       entries for LUN 0 only. For devices that support other  LUNs,  such  as
       some CD changers, the system administrator can edit the driver configu‐
       ration file to add entries for other LUNs.

EXAMPLES
       Example 1 An Example Configuration File for a SCSI Target Driver

       The following is an example configuration file for a SCSI target driver
       called toaster.conf.

	 #
	 # Copyright (c) 1992, by Sun Microsystems, Inc.
	 #
	 #ident "@(#)toaster.conf  1.2	   92/05/12 SMI"
	 name="toaster" class="scsi" target=4 lun=0;

       Add the following lines to  sd.conf for a six- CD changer on  target 3,
       with  LUNs 0 to	5.

	 name="sd" class="scsi" target=3 lun=1;
	 name="sd" class="scsi" target=3 lun=2;
	 name="sd" class="scsi" target=3 lun=3;
	 name="sd" class="scsi" target=3 lun=4;
	 name="sd" class="scsi" target=3 lun=5;

       It is not necessary to add the line for LUN 0, as it already exists  in
       the file shipped with Solaris.

       Example 2 A Stub Device Definition of sd.conf

       The  following  line is a stub device definition which implies the host
       adapter drivers of class scsi-self-identifying might have children that
       bind to the sd(7D) driver:

	 name="sd" class="scsi-self-identifying";

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Availability		     │SUNWckr			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Committed			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       add_drv(1M),	 rem_drv(1M),	   update_drv(1M),     driver.conf(4),
       attributes(5),  fcp(7D),	 ifp(7D),  sata(7D),  scsi_vhci(7D),   sd(7D),
       sf(7D),	 st(7D),   scsi_ifgetcap(9F),  scsi_init_pkt(9F),  scsi_trans‐
       port(9F)

       ANS X3T9.2/82-2 SMALL COMPUTER SYSTEM INTERFACE (SCSI-1)

       ANS X3T9.2/375D Small Computer System Interface - 2 (SCSI-2)

       ANS X3T10/994D SCSI-3 Architecture Model (SAM)

       IEEE 1275 SCSI Target Device Binding

NOTES
       With driver.conf(4) configuration, you need to ensure that  the	target
       and  lun	 values	 claimed  by  your  target driver do not conflict with
       existing target drivers on the system. For example, if the target is  a
       direct  access device, the standard sd.conf file usually makes sd claim
       it before any other driver has a chance to probe it.

SunOS 5.10			  19 May 2009			       scsi(4)
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