How to turn on swap partitions in Fedora Core Linux.

Posted: September 26, 2013. At: 3:08 PM. This was 4 years ago. Post ID: 6346
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I recently wanted to add a swap partition to my Fedora Core 19 system as apparently I was running all this time without one. This is the command that I used to find a partition to use.

root@neo homer# fdisk -l /dev/sdb 
Disk /dev/sdb: 500.1 GB, 500107862016 bytes, 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x03eec363
   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *        2048      882687      440320   83  Linux
/dev/sdb2          882688    25458687    12288000   82  Linux swap / Solaris
/dev/sdb3        25458688   971634687   473088000    7  HPFS/NTFS/exFAT
/dev/sdb4       971638782   976758783     2560001    5  Extended
/dev/sdb5       971638784   976758783     2560000   82  Linux swap / Solaris

This the command that you use to switch on a swap partition.

root@neo homer# swapon /dev/sdb5

And again for /dev/sdb2.

root@neo homer# swapon /dev/sdb2

Now I can list the active swap partitions and get some results.

root@neo homer# cat /proc/swaps 
Filename				Type		Size	Used	Priority
/dev/sdb5                               partition	2559996	0	-1
/dev/sdb2                               partition	12287996	0	-2

This command will also return the same information.

root@neo homer# swapon -s
Filename				Type		Size	Used	Priority
/dev/sdb5                              	partition	2559996	0	-1
/dev/sdb2                              	partition	12287996	0	-2

Using these commands the Linux user will easily be able to add more swap partitions to better manage memory on a Linux system.

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