Set tape density (normally for SCSI tapes). For zftape this ioctl is used
to tune the amount of debugging output produced by the driver. ftape-2.x and
sftape used to utilize MTFSR
(see MTFSR) for doing this. Trace
levels control the amount of debugging output as follows:
This works only if the driver has been compiled without the
`-DNO_TRACE_AT_ALL
' flag (see TRACE_FLAGS). Setting
the trace level to a value >= 5 heavily affects ftape's behavior: it is
more or less unusable. The reason for this is simply the fact that
printing to the system console is rather time consuming and therefore has
a bad impact on the timing of the driver.
mt -f /dev/nqft0 setdensity 0
mt -f /dev/nqft0 setdensity 5
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