ch(4) - NetBSD Manual Pages

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CH(4)                   NetBSD Kernel Interfaces Manual                  CH(4)


NAME

     ch -- SCSI media changer driver


SYNOPSIS

     ch* at scsibus? target ? lun ?


DESCRIPTION

     The ch driver is essentially an ioctl(2) interface to a robot on a SCSI
     bus - a device that will change media (e.g. tapes, CD-ROMs, etc) in and
     out of drives for that media.  The chio(1) utility program uses this
     interface to manipulate such robots.


FILES

     /dev/chu       SCSI bus media changer unit u
     /usr/include/sys/chio.h


DIAGNOSTICS

     ch%d: waiting %d seconds for changer to settle...  Some changers require
     a long time to settle out, to do tape inventory, for instance.

     ch%d: offline  The changer is not responding.

     ch%d: warning, READ ELEMENT STATUS avail != count
     ch%d: could not sense element address page
     ch%d: could not sense capabilities page


SEE ALSO

     chio(1), ioctl(2), cd(4), intro(4), scsi(4), st(4)


AUTHORS

     Jason R. Thorpe

NetBSD 5.1.2                     June 10, 1998                    NetBSD 5.1.2