ch man page on OpenBSD

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CH(4)			  OpenBSD Programmer's 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.

OpenBSD 4.9			 May 31, 2007			   OpenBSD 4.9

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