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CH(4)			 BSD 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

BSD				 June 10, 1998				   BSD

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