NAME

tz − SCSI magnetic tape interface

SYNOPSIS

Digital AlphaServer 8200 and Digital AlphaServer 8400 Qlogic ISP1020:
 bus tlsb0 at nexus? 
 bus tiop0 at tlsb0 vector tioperror
 bus isp0 at ∗ vector ispintr
 controller scsi0 at ∗ vector scsiintr
 controller scsi1 at ∗ vector scsiintr
 tape tz0 at scsi0 drive 0
 disk rz0 at scsi0 drive 0 Digital AlphaServer 8200 and Digital AlphaServer 8400 DEC KZMSA:
 bus tlsb0 at nexus? 
 bus tiop0 at tlsb0 vector tioperror
 bus xmi0 at tiop? vector xmierror
 bus xza0 at xmi?
 controller scsi0 at ∗ vector scsiintr
 controller scsi1 at ∗ vector scsiintr
 tape tz0 at scsi0 drive 0
 disk rz0 at scsi0 drive 0  DEC 7000/10000 DEC KZMSA:
 bus lsb0 at nexus? 
 bus iop0 at lsb0 vector ioperror
 bus xmi0 at iop0 vector xmierror
 bus xza0 at xmi?
 controller scsi0 at ∗ vector scsiintr
 controller scsi1 at ∗ vector scsiintr
 tape tz0 at scsi0 drive 0
 disk rz0 at scsi0 drive 0  DEC 4000 DEC SIOP:
 bus ibus0 at nexus? 
 bus lbus0 at ibus0
 bus siop0 at lbus0 slot 0 vector siopcointr
 controller scsi0 at ∗ vector scsiintr
 tape tz0 at scsi0 drive 0
 disk rz0 at scsi0 drive 0  DEC 3000 NCR ASC:
 bus tc0 at nexus? 
 bus tcds0 at ∗ vector tcdsintr
 controller scsi0 at ∗ vector scsiintr
 controller scsi1 at ∗ vector scsiintr
 tape tz0 at scsi0 drive 0
 disk rz0 at scsi0 drive 0  DEC 3000 DEC KZTSA:
 bus tc0 at nexus? 
 bus tza0 at ∗ vector kztsaintr
 controller scsi0 at ∗ vector scsiintr
 tape tz0 at scsi0 drive 0
 disk rz0 at scsi0 drive 0  DEC PCI bus DEC KZPSA:
 bus pci0 at ∗
 bus pza0 at pci? vector pzaintr
 controller scsi0 at ∗ vector scsiintr
 tape tz0 at scsi0 drive 0
 disk rz0 at scsi0 drive 0  DEC PCI bus NCR 810:
 bus pci0 at ∗
 bus psiop at pci? vector psiopintr
 controller scsi0 at ∗ vector scsiintr
 tape tz0 at scsi0 drive 0
 disk rz0 at scsi0 drive 0  DEC PCI bus Qlogic ISP1020:
 bus pci0 at ∗
 bus isp0 at ∗ vector ispintr
 controller scsi0 at ∗ vector scsiintr
 tape tz0 at scsi0 drive 0
 disk rz0 at scsi0 drive 0 DEC EISA bus Adaptec 1740:
 bus eisa0 at ∗
 bus aha0 at ∗ vector ahaintr
 controller scsi0 at ∗ vector scsiintr
 tape tz0 at scsi0 drive 0
 disk rz0 at scsi0 drive 0

DESCRIPTION

The Small Computer System Interface (SCSI) tape driver provides a standard tape drive interface as described in mtio(7).  This is the tape driver for any Digital SCSI tape device.  Facilities are provided to allow the addition of third-party SCSI tape drives to the system. Refer to the /usr/sys/data/cam_data.c file for instructions. 

For reads from Beginning of Media (BOM), the density of the tape is obtained from the drive.  Autodensity selection is then used for all read operations.  This means that reads are performed in the density of the tape.  For writes from BOM, the density and blocking factor of the tape are set.  The tape is written in the density and blocking factor that the user has selected by specifying one of the following device special files: rmt?a; rmt?l; rmt?m; or rmt?h. 

The following are the default densities for specific SCSI tape drives:

    TZ30: Single-density drive.
rmt?a 6666 BPI
rmt?l 6666 BPI
rmt?m 6666 BPI
rmt?h 6666 BPI
    TZ85: Single-density drive.
          Read TK50 and TZ30 formats.
rmt?a 42500 BPI
rmt?l 42500 BPI
rmt?m 42500 BPI
rmt?h 42500 BPI
    TZ86: Single-density drive.
          Read/write TZ85 format.
          Read TK50 and TZ30 format.
rmt?a 42500 BPI
rmt?l 42500 BPI
rmt?m 42500 BPI
rmt?h 42500 BPI
    TZ87: Multi-density drive, compaction support.
          Read/write TZ85 and TZ86 formats.
          Read TK50 format.
rmt?a 42500 BPI
rmt?l 42500 BPI
rmt?m 62500 BPI
rmt?h 62500 BPI, compaction turned on.
    TLZ04: Single-density drive.
rmt?a 61000 BPI
rmt?l 61000 BPI
rmt?m 61000 BPI
rmt?h 61000 BPI
    TLZ06: Single-density drive, compaction support.
           Read/write TLZ04 format.
rmt?a 61000 BPI
rmt?l 61000 BPI
rmt?m 61000 BPI, compaction turned on.
rmt?h 61000 BPI, compaction turned on.
    TLZ07: Single-density drive, compaction support.
           Read/write TLZ04 and TLZ06 format.
rmt?a 61000 BPI
rmt?l 61000 BPI
rmt?m 61000 BPI, compaction turned on.
rmt?h 61000 BPI, compaction turned on.
    TSZ07: Dual-density drive.
rmt?a 6250 BPI
rmt?l 1600 BPI
rmt?m 1600 BPI
rmt?h 6250 BPI
    TKZ08: Single-density drive (Exabyte 8200).
rmt?a 54000 BPI
rmt?l 54000 BPI
rmt?m 54000 BPI
rmt?h 54000 BPI
    TKZ09: Dual-format drive, supports Exabyte 8200 and 8500
    formats.
rmt?a 54000 BPI (8200 format)
rmt?l 54000 BPI (8200 format)
rmt?m 45434 BPI (8500 format)
rmt?h 45434 BPI (8500 format)
    TZK10: Quad-format drive.
 See description that follows.
    TZK11: QIC-format drive.
See description that follows.

The following formats are supported for the TZK10 QIC-format tape drive: QIC-24 (read-only) 512-byte block size; QIC-120 and QIC-150 (read/write) 512-byte block size; and QIC-320 (read/write) variable block size.  With QIC-format tapes, except QIC-320 and QIC-525, all read and write operations must be in multiples of the block size because record boundaries are not preserved. Use the following device special file names to select QIC densities:

The following formats are supported for the TZK11 QIC-format tape drive: QIC-24 (read only) 512-byte block size; QIC-120 and QIC-150 (read/write) 512-byte block size; and QIC-320/525/1Gig/2Gig (read/write) variable block size.  With QIC-format 24/120/150 tapes, all read and write operations must be in multiples of the block size because record boundaries are not preserved.  Use the following device special file names to select QIC densities:

The TZK11 tape drive uses autodensity select feature of the drive. The 2 Gig density can only be written on a 2 Gig cartridge.  The 1 Gig density can only be written on a 1 Gig cartridge.  The 320/525 cartridge can be used to write 120/150/320/525 densities. With all fixed-block tape devices, when you use the dd command to transfer a file to tape you must use padding to complete a block by specifying the conv=sync option.  For example, the following two dd commands use the conv=sync option to transfer the /etc/motd file with a size of approximately 400 bytes to the QIC-format tape drives:

dd if=/etc/motd of=/dev/rmt0m bs=10k conv=sync

dd if=/etc/motd of=/dev/rmt0l bs=512 conv=sync

Tape Support

Refer to the Software Product Description (SPD) for information on the hardware that is supported on the various system platforms. 

EXAMPLES

The following example shows the configuration specification that you might have for a DEC 3000 Model 500 system with a PMAZC controller in slot 0 and KZTSA devices in slots 1 and 2:

bus tc0 at nexus?
bus tcds0 at tc0 slot 6 vector tcdsintr         # onboard scsi
bus tcds1 at tc0 slot 0 vector tcdsintr         # PMAZC in tc slot 0
bus tza0 at tc0 slot 1 vector kztsaintr         # KZTSA in tc slot 1
bus tza1 at tc0 slot 2 vector kztsaintr         # KZTSA in tc slot 2
controller scsi0 at tcds0 slot 0 vector scsiintr # Internal port
controller scsi1 at tcds0 slot 1 vector scsiintr # External port
controller scsi2 at tcds1 slot 0 vector scsiintr # A port
controller scsi3 at tcds1 slot 1 vector scsiintr # B port
controller scsi4 at tza0 slot 0 vector scsiintr
controller scsi5 at tza1 slot 0 vector scsiintr
disk rz3  at scsi0 drive 24                     # bus 0, target 3 lun 0
disk rz10 at scsi1 drive 80                     # bus 1, target 2 lun 0
disk rz10 at scsi1 drive 81                     # bus 1, target 2 lun 1
disk rz32 at scsi4 drive 256                    # bus 4, target 0 lun 0
disk rz41 at scsi5 drive 328                    # bus 5, target 1 lun 0
tape tz22 at scsi2 drive 176                    # bus 2, target 6 lun 0
tape tz24 at scsi3 drive 320                    # bus 3, target 0 lun 0

ERRORS

All diagnostic messages are sent to the error logger subsystem. 

FILES

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

RELATED INFORMATION

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