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), intro(4), scsi(4), cd(4), st(4)

AUTHORS
Jason R. Thorpe