1999-03-16 04:19:14 +03:00
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.\" $NetBSD: drum.4,v 1.4 1999/03/16 01:19:15 garbled Exp $
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1994-11-30 19:22:03 +03:00
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.\"
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.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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1993-03-21 12:45:37 +03:00
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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1994-11-30 19:22:03 +03:00
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.\" @(#)drum.4 8.1 (Berkeley) 6/5/93
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1993-03-21 12:45:37 +03:00
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.\"
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1994-11-30 19:22:03 +03:00
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.Dd June 5, 1993
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1993-03-21 12:45:37 +03:00
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.Dt DRUM 4
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1999-03-16 04:19:14 +03:00
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.Os
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1993-03-21 12:45:37 +03:00
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.Sh NAME
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.Nm drum
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.Nd paging device
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.Sh DESCRIPTION
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This file refers to the paging device in use by the system.
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This may actually be a subdevice of one of the disk drivers, but in
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a system with paging interleaved across multiple disk drives
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it provides an indirect driver for the multiple drives.
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.Sh FILES
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.Bl -tag -width /dev/drum
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.It Pa /dev/drum
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.El
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.Sh HISTORY
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The
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.Nm
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special file appeared in
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.Bx 3.0 .
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.Sh BUGS
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Reads from the drum are not allowed across the interleaving boundaries.
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Since these only occur every .5Mbytes
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or so,
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and since the system never allocates blocks across the boundary,
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this is usually not a problem.
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