SCSI, RAID - Small Computer System Interface
dsk#, tape#_d#, cdrom#
The operating system interfaces to disk and tape devices
through the Small Computer System Interface (SCSI). SCSI
support is limited to the HP-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 [Toc] [Back]
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 [Toc] [Back]
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 reassigned.
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.
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
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 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.
atapi_ide(7), dsfmgr(8), emx(7), hwmgr(8), rz(7), tz(7),
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