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CH(4) Device Drivers Manual CH(4)

chSCSI media changer driver

ch* at scsibus? target ? lun ?

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.

/dev/chu
SCSI bus media changer unit u

/usr/include/sys/chio.h

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

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

Jason R. Thorpe

June 10, 1998 NetBSD-9.2