Digital

NAME

tz − SCSI magnetic tape interface

SYNOPSIS

RISC DEC SII:
adapteribus0at nexus? 
controllersii0at ibus?vector sii_intr
tapetz0at sii0drive 0

RISC DEC KZQ:
adapteruba0at nexus? 
controllerkzq0at ibus? csr 0761300 vector sii_intr
tapetz0at kzq0drive 0

RISC NCR ASC:
adapteribus0at nexus? 
controllerasc0at ibus?vector ascintr
tapetz0at asc0drive 0

DESCRIPTION

The SCSI tape driver provides a standard tape drive interface as described in mtio(7).  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 preserved. The QIC densities are selected using the following special device names:

rmt?a QIC-24 Fixed block size. 
rmt?l QIC-120 Fixed block size. 
rmt?m QIC-150 Fixed block size. 
rmt?h QIC-320 Fixed block size. 

With all fixed block tape devices a dd of a file to the tape must be padded out. An example of this is a dd of /etc/motd which has a size of approximately 400 bytes. 

dd if=/etc/motd of=/dev/rmt0h bs=10k conv=sync
or
dd if=/etc/motd of=/dev/rmt0l bs=512 conv=sync

The option of conv=sync pads the output to block size. 

Tape Support

TZ30, TZK50, TLZ04, TSZ05, TKZ08, TZK10

ERRORS

All diagnostic messages are sent to the error logger subsystem. 

FILES

/dev/rmt???
/dev/nrmt???

RELATED INFORMATION

mtio(7), SCSI(7), MAKEDEV(8), uerf(8), tapex(8)