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tz

tz(4) Kernel Interfaces Manual tz(4)

Name
tz - SCSI magnetic tape interface

Syntax
VAX NCR 5380:
adapter uba0 at nexus?
controller scsi0 at uba0 csr 0x200c0080 vector szintr
tape tz0 at scsi0 drive 0

VAX DEC SII:
adapter ibus0 at nexus?
controller sii0 at ibus? vector sii_intr
tape tz0 at sii0 drive 0

RISC DEC SII:
adapter ibus0 at nexus?
controller sii0 at ibus? vector sii_intr
tape tz0 at sii0 drive 0

RISC DEC KZQ:
adapter uba0 at nexus?
controller kzq0 at ibus? csr 0761300vector sii_intr
tape tz0 at kzq0 drive 0

RISC NCR ASC:
adapter ibus0 at nexus?
controller asc0 at ibus? vector ascintr
tape tz0 at asc0 drive 0

Description
The SCSI tape driver provides a standard tape drive interface as described in This is a driver for any Digital SCSI tape device.

For the TZK10 QIC format tape drive, the densities supported are QIC-24 (read only) block size of 512 byte blocks, QIC-120, and QIC-150
read/write block size of 512 byte blocks, and QIC-320 read/write block size of 1024 byte blocks. With QIC format style tapes all reads and
writes must be in multiple of the block size. This is a requirement of fixed block tape drives because record boundaries are not pre-
served. The QIC densities are selected using the following special device names:

QIC-24 Fixed block size.
QIC-120 Fixed block size.
QIC-150 Fixed block size.
QIC-320 Fixed block size.

With all fixed block tape devices a of a file to the tape must be padded out. An example of this is a of which has a size of approximately
3800 bytes.
dd if=/etc/gettytab of=/dev/rmt0h bs=10k conv=sync
or
dd if=/etc/gettytab of=/dev/rmt0l bs=512 conv=sync
The option of pads the output to block size.

This driver also supports n-buffered reads and writes to the raw tape interface (used with streaming tape drives). See for further
details.

Tape Support
TZ30, TZK50, TLZ04, TSZ05, TKZ08, TZK10

Diagnostics
All diagnostic messages are sent to the error logger subsystem.

Files
See Also
mtio(4), nbuf(4), SCSI(4), MAKEDEV(8), uerf(8), tapex(8)
Guide to the Error Logger

tz(4)

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