SCSI(HW) XENIX System V SCSI(HW)
Name
scsi - Small computer systems interface.
Description
SCSI provides a standard interface for peripherals such as
hard disks, printers, tape drives and others. SCSI is run
via a host adapter card that can support up to 7 devices.
The minor device numbering scheme for SCSI devices (for
example, a hard disk) is the same as the standard minor
device number scheme for non-SCSI devices.
Each SCSI device has its own major device number.
Notes
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| This functionality is not|
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| distributions. |
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Currently, the only SCSI host adapter card supported is the
Adaptec AHA-1540 controlling 1 or 2 hard disks and 1 tape
drive.
Unsupported Tape Devices
Although some tape drives are not supported (example: DAT
and 8mm tape drives), the SCSI driver permits the connection
of these devices. In order to use these tape drives you
must create the special device files manually. Here is a
description of additional tape device nodes:
Name Major Minor See Note Tape Type
__________________________________________________________________
/dev/rct0 34+TID 0 1, 5 QIC, 9TLD
/dev/brct0 34+TID 4 1, 6 9TLD, HS
/dev/nrct0 34+TID 8 2, 5 QIC, 9TLD
/dev/bnrct0 34+TID 12 2, 6 9TLD, HS
/dev/hirct0 34+TID 16 4, 1, 5 9THD
/dev/hibrct0 34+TID 20 4, 1, 6 9THD
/dev/hinrct0 34+TID 24 4, 2, 5 9THD
/dev/hibnrct0 34+TID 28 4, 2, 6 9THD
/dev/urct0 34+TID 32 3, 5 QIC, 9TLD
/dev/burct0 34+TID 36 3, 6 9TLD, HS
/dev/hiurct0 34+TID 48 4, 3, 5 9THD
/dev/hiburct0 34+TID 52 4, 3, 6 9THD
Tape Type:
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SCSI(HW) XENIX System V SCSI(HW)
9THD Nine Track Hi-Density Tape (reel-to-reel)
HS Helical Scan Tape drive (WangDAT/Exabyte)
9TLD Nine Track Low-Density Tape (reel-to-reel)
QIC Quarter Inch Tape Cartridge
NOTES:
This device will do a tape rewind and unload at the
end of the operation (at close).
This device will not issue a rewind to the device, but
an unload will be issued. On some tape drives an
unload implies a rewind will be done (at close).
This device will issue a rewind, but no unload will be
done (at close).
This is used to set the tape operation to high density
for reel-to- reel tape drives (at close).
This device uses a 512 byte block size. For typical
quarter-inch tape drives.
This device uses a 1024 byte block size. To be used
for devices, that do not have a fixed block size, such
as a helical scan tape, or reel-to-reel tape. Using
this device on a quarter inch tape drive will not have
any effect.
You cannot run mkdev tape to add drives other than the QIC
type because they are not supported. The default devices
are /dev/rct0 and /dev/nrct0. To create the other entries,
you will need to do:
mknod /dev/name c 34+TID major minor
(Reg.).DE
Where name is a name from the left column in the
drive table. TID is the target ID of the SCSI tape
drive you are installing.
For instance, to create the /dev/urct0 device, with
the tape drive target ID set to 2, you would enter the following:
mknod /dev/urct0 c 36 32
See Also
hd(HW), tape(HW)
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