Technical data

xt(7D) Devices SunOS 5.5
NAME xt − driver for Xylogics 472 1/2 inch tape controller
SYNOPSIS xt@2d,ee60:[l,m][b][n]
xt@2d,ee68:[l,m][b][n]
AVAILABILITY Only available on Sun-4/200, Sun-4/300, and Sun-4/400 series systems.
DESCRIPTION The Xylogics 472 tape controller controls Pertec-interface 1/2” tape drives such as the
Fujitsu M2444 and the CDC Keystone III. The xt driver provides a standard tape interface
to the device; see mtio(7I) for details.
The xt driver supports the character device interface. The driver can be opened with
either rewind on close or no rewind on close options. The tape format and options are
specified using the device name (see FILES below).
EOT Handling The user will be notified of end of tape (EOT) on write by a 0 byte count returned the first
time this is attempted. This write must be retried by the user. Subsequent writes will be
successful until the tape winds off the reel. Reading past EOT is transparent to the user.
IOCTL See mtio(7I) for a list of ioctls available for tape devices. However, not all devices sup-
port all ioctls. The driver returns anENOTTY error on unsupported ioctls.
1/2” tape devices do not support the tape retension function.
ERRORS EACCES The driver is opened for write access and the tape is write protected.
EBUSY The tape drive is in use by another process. Only one process can use the
tape drive at a time.
EINVAL The requested number of bytes for a read operation is less than the actual
record length on the tape.
EIO During opening, the tape device is not ready because either no tape is in the
drive, or the drive is not on-line. Once open, this error is returned if the
requested I/O transfer could not be completed.
ENOTTY This indicates that the tape device does not support the requested ioctl
function.
ENXIO During opening, the tape device does not exist.
FILES /kernel/drv/xt driver module
/kernel/drv/xt.conf driver configuration file
/dev/rmt/[0−1][l,m][b][n] raw devices
For raw devices l,m specifies the density (low, medium), and b the optional BSD
behavior (see mtio(7I)) and n the optional no rewind behavior. For example
/dev/rmt/0lbn specifies unit 0, low density, BSD behavior, and no rewind.
7D-408 modified 4 Mar 1993