CH(4) BSD Kernel Interfaces Manual CH(4)
ch -- SCSI media-changer (juke box) driver
ch? at scsibus?
The ch driver provides support for SCSI juke boxes. It allows many slots
of media to be multiplexed between a number of drives.
A SCSI adapter and a logical scsibus must also be separately configured
into the system before a SCSI changer can be configured.
As the SCSI adapter is probed during boot, the SCSI bus is scanned for
devices. Any devices found which answer as "Changer" type devices will
be ``attached'' to the ch driver. The first device found will be
attached as ch0 and the next ch1, etc. It is also possible to specify
what ch unit a device should come on-line as; refer to scsi(4) for
details on kernel configuration.
/dev/ch[0-9] device entries
chio(1), cd(4), intro(4), scsi(4), sd(4), st(4)
The ch driver appeared in 386BSD 0.1.
BSD October 6, 2011 BSD