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28 .\" @(#)swapon.8 8.1 (Berkeley) 6/5/93
35 .Nm swapon , swapoff , swapctl
36 .Nd "specify devices for paging and swapping"
58 utilities are used to control swap devices in the system.
59 At boot time all swap entries in
61 are added automatically when the system goes multi-user.
62 Swap devices use a fixed interleave; the maximum number of devices
64 There is no priority mechanism.
68 utility adds the specified swap devices to the system.
71 option is used, all swap devices in
73 will be added, unless their
83 option will be added as well as ones with no option.
87 informational messages will not be
88 written to standard output when a swap device is added.
92 utility removes the specified swap devices from the system.
95 option is used, all swap devices in
97 will be removed, unless their
105 swap devices with the
107 option will be removed as well as ones with no option.
111 informational messages will not be
112 written to standard output when a swap device is removed.
115 will fail and refuse to remove a swap device if there is insufficient
116 VM (memory + remaining swap devices) to run the system.
120 must move swapped pages out of the device being removed which could
121 lead to high system loads for a period of time, depending on how
122 much data has been swapped out to that device.
124 Other options supported by both
129 .Bl -tag -width indent
138 utility exists primarily for those familiar with other
141 used to add, remove, or list swap devices.
144 option is used differently in
146 and indicates that a specific list of devices should be added.
149 option indicates that a specific list should be removed.
156 operate on all swap entries in
158 which do not have their
162 Swap information can be generated using the
172 utility has the following options for listing swap:
173 .Bl -tag -width indent
175 Output values in human-readable form.
177 Output values in gigabytes.
179 Output values in kilobytes.
181 Output values in megabytes.
183 List the devices making up system swap.
185 Print a summary line for system swap.
189 environment variable is used if not specifically
191 512 byte blocks are used by default.
194 .Bl -tag -width ".Pa /dev/{ada,da}?s?b" -compact
195 .It Pa /dev/{ada,da}?s?b
196 standard paging devices
201 file system description table
204 These utilities may fail for the reasons described in
222 utilities appeared in