04-15-2001
in Linux it is pretty easy:
this example will give you extra 32MB of swap space than you already have(use free command to see existing swap spce)
# dd if=/dev/zero of=/example/moreswap bs=1024 count=32768.
this makes an empty 32 MB file you can use for swap space.
# mkswap /example/moreswap
you have now turned "moreswap" empty file into 32MB of additional swap space.
Now to use it:
#swapon /example/moreswap
check to see how much is available by running the 'free' command. you will see you have 32MB more than you had before.
If you want this to be persistent across boots, edit the /etc/rc.d/rc.local file. add these lines to the bottom of the file:
swapon /example/moreswap
To disable:
# swapoff /example/moreswap
To remove:
# rm /moreswap
in solaris instead of this you can use(you should confirm it by some other way)
# mkfile 32m /example/moreswap
# swap -a /example/moreswap
if you want this to be persistent across boots, add following lines to your filesystem table
/example/moreswap - - swap - no -
hope this will help you
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LEARN ABOUT DEBIAN
swapon
SWAPON(8) System Administration SWAPON(8)
NAME
swapon, swapoff - enable/disable devices and files for paging and swapping
SYNOPSIS
Get info:
swapon -s [-h] [-V]
Enable/disable:
swapon [-d] [-f] [-p priority] [-v] specialfile...
swapoff [-v] specialfile...
Enable/disable all:
swapon -a [-e] [-f] [-v]
swapoff -a [-v]
DESCRIPTION
swapon is used to specify devices on which paging and swapping are to take place.
The device or file used is given by the specialfile parameter. It may be of the form -L label or -U uuid to indicate a device by label or
uuid.
Calls to swapon normally occur in the system boot scripts making all swap devices available, so that the paging and swapping activity is
interleaved across several devices and files.
swapoff disables swapping on the specified devices and files. When the -a flag is given, swapping is disabled on all known swap devices
and files (as found in /proc/swaps or /etc/fstab).
-a, --all
All devices marked as ``swap'' in /etc/fstab are made available, except for those with the ``noauto'' option. Devices that are
already being used as swap are silently skipped.
-d, --discard
Discard freed swap pages before they are reused, if the swap device supports the discard or trim operation. This may improve per-
formance on some Solid State Devices, but often it does not. The /etc/fstab mount option discard may be also used to enable discard
flag.
-e, --ifexists
Silently skip devices that do not exist. The /etc/fstab mount option nofail may be also used to skip non-existing device.
-f, --fixpgsz
Reinitialize (exec /sbin/mkswap) the swap space if its page size does not match that of the the current running kernel. mkswap(2)
initializes the whole device and does not check for bad blocks.
-h, --help
Provide help.
-L label
Use the partition that has the specified label. (For this, access to /proc/partitions is needed.)
-p, --priority priority
Specify the priority of the swap device. priority is a value between 0 and 32767. Higher numbers indicate higher priority. See
swapon(2) for a full description of swap priorities. Add pri=value to the option field of /etc/fstab for use with swapon -a.
-s, --summary
Display swap usage summary by device. Equivalent to "cat /proc/swaps". Not available before Linux 2.1.25.
-U uuid
Use the partition that has the specified uuid.
-v, --verbose
Be verbose.
-V, --version
Display version.
NOTES
You should not use swapon on a file with holes. Swap over NFS may not work.
swapon automatically detects and rewrites swap space signature with old software suspend data (e.g S1SUSPEND, S2SUSPEND, ...). The problem
is that if we don't do it, then we get data corruption the next time an attempt at unsuspending is made.
swapon may not work correctly when using a swap file with some versions of btrfs. This is due to the swap file implementation in the ker-
nel expecting to be able to write to the file directly, without the assistance of the file system. Since btrfs is a copy-on-write file
system, the file location may not be static and corruption can result. Btrfs actively disallows the use of files on its file systems by
refusing to map the file. This can be seen in the system log as "swapon: swapfile has holes." One possible workaround is to map the file to
a loopback device. This will allow the file system to determine the mapping properly but may come with a performance impact.
SEE ALSO
swapon(2), swapoff(2), fstab(5), init(8), mkswap(8), rc(8), mount(8)
FILES
/dev/sd?? standard paging devices
/etc/fstab ascii filesystem description table
HISTORY
The swapon command appeared in 4.0BSD.
AVAILABILITY
The swapon command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
util-linux September 1995 SWAPON(8)