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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
103 informational messages will not be
104 written to standard output when a swap device is removed.
107 will fail and refuse to remove a swap device if there is insufficient
108 VM (memory + remaining swap devices) to run the system.
112 must move swapped pages out of the device being removed which could
113 lead to high system loads for a period of time, depending on how
114 much data has been swapped out to that device.
116 Other options supported by both
121 .Bl -tag -width indent
130 utility exists primarily for those familiar with other
133 used to add, remove, or list swap devices.
136 option is used differently in
138 and indicates that a specific list of devices should be added.
141 option indicates that a specific list should be removed.
148 operate on all swap entries in
150 which do not have their
154 Swap information can be generated using the
164 utility has the following options for listing swap:
165 .Bl -tag -width indent
167 Output values in human-readable form.
169 Output values in gigabytes.
171 Output values in kilobytes.
173 Output values in megabytes.
175 List the devices making up system swap.
177 Print a summary line for system swap.
181 environment variable is used if not specifically
183 512 byte blocks are used by default.
186 .Bl -tag -width ".Pa /dev/{ada,da}?s?b" -compact
187 .It Pa /dev/{ada,da}?s?b
188 standard paging devices
193 file system description table
196 These utilities may fail for the reasons described in
214 utilities appeared in