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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.
91 option causes each of following devices to receive a
93 command to mark all blocks as unused.
97 utility removes the specified swap devices from the system.
100 option is used, all swap devices in
102 will be removed, unless their
108 only swap devices with the
110 option will be removed.
114 informational messages will not be
115 written to standard output when a swap device is removed.
118 will fail and refuse to remove a swap device if there is insufficient
119 VM (memory + remaining swap devices) to run the system.
123 must move swapped pages out of the device being removed which could
124 lead to high system loads for a period of time, depending on how
125 much data has been swapped out to that device.
127 Other options supported by both
132 .Bl -tag -width indent
141 utility exists primarily for those familiar with other
144 used to add, remove, or list swap devices.
147 option is used differently in
149 and indicates that a specific list of devices should be added.
152 option indicates that a specific list should be removed.
159 operate on all swap entries in
161 which do not have their
165 Swap information can be generated using the
175 utility has the following options for listing swap:
176 .Bl -tag -width indent
178 Output values in human-readable form.
180 Output values in gigabytes.
182 Output values in kilobytes.
184 Output values in megabytes.
186 List the devices making up system swap.
188 Print a summary line for system swap.
192 environment variable is used if not specifically
194 512 byte blocks are used by default.
197 .Bl -tag -width ".Pa /dev/{ada,da}?s?b" -compact
198 .It Pa /dev/{ada,da}?s?b
199 standard paging devices
204 file system description table
207 These utilities may fail for the reasons described in
225 utilities appeared in