manual page distributed with 4.1BSD

SCCS-vsn: share/man/man4/drum.4 4.1

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+.\" Copyright (c) 1980 Regents of the University of California.
+.\" All rights reserved.  The Berkeley software License Agreement
+.\" specifies the terms and conditions for redistribution.
+.\"
+.\"    @(#)drum.4      4.1 (Berkeley) %G%
+.\"
+.TH DRUM 4 5/11/81
+.UC 4
+.SH NAME
+drum \- paging device
+.SH DESCRIPTION
+This file refers to the paging device in use by the system.
+This may actually be a subdevice of one of the disk drivers, but in
+a system with paging interleaved across multiple disk drives
+it provides an indirect driver for the multiple drives.
+.SH FILES
+/dev/drum
+.SH BUGS
+Reads from the drum are not allowed across the interleaving boundaries.
+Since these only occur every
+.BR . 5Mbytes
+or so,
+and since the system never allocates blocks across the boundary,
+this is usually not a problem.