SCSI(7) 						 Miscellaneous Information Manual						   SCSI(7)

NAME

       SCSI, RAID - Small Computer System Interface

SYNOPSIS

       dsk#, tape#_d#, cdrom#

DESCRIPTION

       The  operating  system  interfaces to disk and tape devices through the Small Computer System Interface (SCSI).	SCSI support is limited to
       the Compaq-supplied storage devices and certain third-party devices.  To determine which named devices are supported in the default system,
       refer  to  the  file  /etc/ddr.dbase.   For example, the following devices are listed therein: Winchester disks: RZ24L, RZ25, RZ25L, RZ25M,
       RZ28M, RZ29B, RZ55, RZ56, RZ58, RZ73, RZ74, RX23, RX26, RX33, IOMEGA ZIP, RAID (Redundant Arrays of Independent	Disks)	SCSI  controllers:
       HSZ10,  HSZ40,  HSZ80  Magnetic	tapes:	TZ30, TZK11, TLZ06, TKZ09, TKZ60, DLT8000, SDT-10000 Media Changers: TL800, ESL9000 Optical disks:
       RRD42, RRD43, RRD44

       Vendors can add their own devices to ddr.dbase.

       Refer to the Software Product Description (SPD) for a given release of the operating system  for  more  information  on	processor-specific
       device support.

       Under the operating system, a SCSI device is referred to by a device identifier that is assigned by the operating system.  This name has no
       relationship to the descriptive name of the device, although in previous releases of the operating system disks such as the RZ74 mapped	to
       a system-assigned rz# logical name (where # was the instance number of that disk.

       Current	logical  names	for  SCSI disks and tapes take the forms specified in the rz(8) and tz(7) reference pages, such as dsk? and tape?.
       Refer to the dsfmgr(8) reference page for the naming conventions for disks, tapes and other devices, such as CD-ROM readers.  Refer to  the
       hwmgr(8) reference page for information on determining device names and other device data.

   SCSI Device Limits
       The number of possible target device IDs is determined by the controller type and method of connection, such as a multibus connection using
       fibre channel.  Refer to the emx(7) reference page for an example of device addressing.

   Device Special Files
       The dsfmgr command creates device special files for all the devices that are attached to SCSI controllers.  This event occurs automatically
       on  system  startup,  and  no administrative intervention is required unless an event requires that a device be renamed or its I/O be reas-
       signed.	In such cases, you can use dsfmgr and hwmgr to manage SCSI devices and their associated device special files without the  need	to
       calculate values from their Bus, Target ID, and LUN data.

RESTRICTIONS

       The  SCSI  device driver is not warrantied to operate with optical disks other than the devices listed in /etc/ddr.dbase/.  The SCSI driver
       attempts to support, on a best-effort basis, disks and magnetic tapes supplied by other vendors.

       The following notes apply to the driver's handling of disks from other vendors: These disks are identified using the following  command:  #
       hwmgr  -get  attribute  -a  name  This command will return the device name SCSI-WWID (World-Wide Identifier) for all devices on the system,
       which includes the model name of the device.  You can filter the output by specifying categories of devices.  Disks are assigned a  default
       partition  table.  The  default	table  can  be	modified by editing the ccmn_rzxx_sizes[8] entry in the /usr/sys/data/cam_data.c file. The
       disklabel command can also be used to modify the partition table on an RZxx disk.

RELATED INFORMATION

       atapi_ide(7), dsfmgr(8), emx(7), hwmgr(8), rz(7), tz(7), disklabel(8), ddr.dbase(4) delim off

																	   SCSI(7)