drum man page on 4.4BSD

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DRUM(4)			 BSD Kernel Interfaces Manual		       DRUM(4)

NAME
     drum — paging device

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.

FILES
     /dev/drum

HISTORY
     The drum special file appeared in 3.0BSD.

BUGS
     Reads from the drum are not allowed across the interleaving boundaries.
     Since these only occur every .5Mbytes or so, and since the system never
     allocates blocks across the boundary, this is usually not a problem.

4th Berkeley Distribution	 June 5, 1993	     4th Berkeley Distribution
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