SWAPTAB(5)

NAME
swaptab - static table of paging files

SYNOPSIS
/etc/swaptab

DESCRIPTION
The /etc/swaptab file contains entries for files that can be enabled for system paging/swapping. This file is read automatically by the mach_swapon(8) command at system startup time. If you change this file, the changes will not take effect until the system is rebooted.

An entry for a paging file consists of a line of the following form:

    file [option[,option]...] [# comment]

file
    is the pathname of the file to page into

option
    is one of:

    prefer
        Enable this file as a "preferred" paging area. The system will preferentially allocate space in this paging file over non-preferred paging files.

    noauto
        Do not enable this file when mach_swapon -a is called.

    lowat=size
        Attempt to shrink the file down to the low water mark, size, when paging resources are freed. If size equals zero, then the paging file does not shrink as resources are freed.

    hiwat=size
        Do not grow the paging file above the high water mark, size. If size is zero then the file will grow as large as needed.

    nocompress
        Do not compress the swapfile. Normally, the swapfile is compressed, resulting in reduced disk usage and increased swapping performance (there is less to swap). This option will turn this feature off.

comment
    Anything preceded by a # is ignored.

EXAMPLE

#
#	/etc/swaptab
#
/private/vm/swapfile	lowat=20971520	# 20 Meg low water mark

FILES
/etc/swaptab

SEE ALSO
mach_swapon(2), mach_swapon(8)

WARNINGS
Entries beginning with whitespace will be ignored.