1999-03-16 04:19:14 +03:00
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.\" $NetBSD: ch.4,v 1.2 1999/03/16 01:19:15 garbled Exp $
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1998-06-10 15:15:20 +04:00
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.\"
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.Dd June 10, 1998
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.Dt CH 4
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1999-03-16 04:19:14 +03:00
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.Os
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1998-06-10 15:15:20 +04:00
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.Sh NAME
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.Nm ch
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.Nd SCSI media changer driver
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.Sh SYNOPSIS
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.Cd "ch* at scsibus? target ? lun ?"
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.Sh DESCRIPTION
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The
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.Nm
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driver is essentially an
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.Xr ioctl 2
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interface to a robot on a
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.Tn SCSI
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bus - a device that will change media (e.g. tapes, CD-ROMs, etc)
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in and out of drives for that media.
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The
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.Xr chio 1
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utility program uses this interface to manipulate such robots.
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.Sh FILES
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.Bl -tag -width /dev/rsdXXXXX -compact
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.It Pa /dev/ch Ns Ar u
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.Tn SCSI
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bus media changer unit
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.Ar u
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.El
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.Pa /usr/include/sys/chio.h
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.Sh DIAGNOSTICS
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.Bl -diag
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.It "ch%d: waiting %d seconds for changer to settle..."
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Some changers require a long time to settle out,
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to do tape inventory, for instance.
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.It "ch%d: offline"
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The changer is not responding.
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.It "ch%d: warning, READ ELEMENT STATUS avail != count"
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.It "ch%d: could not sense element address page"
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.It "ch%d: could not sense capabilities page"
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.El
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.Sh SEE ALSO
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.Xr chio 1 ,
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.Xr ioctl 2 ,
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.Xr intro 4 ,
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.Xr scsi 4 ,
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.Xr cd 4 ,
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.Xr st 4
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.Sh AUTHORS
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Jason R. Thorpe
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