SWAPFILE OR SWAPSPACE
Add a Swap File
dd if=/dev/zero of=/swapfile bs=1024 count=65536(6MB Swap file)
mkswap /swapfile
swapon /swapfile
/etc/fstab entry for permanent swapfile on boot time
/swapfile swap swap defaults 0 0
[root@svn ~]# cat /proc/swaps
Filename Type Size Used Priority
/dev/dm-1 partition 2031612 0 -1
/swapfile file 65532 0 -2
Remove the Swap File
swapoff -v /swapfile
remove it entry from /etc/fstab
rm /swapfile
[root@svn ~]# cat /proc/swaps
Filename Type Size Used Priority
/dev/dm-1 partition 2031612 0 -1
Add a Swap Space
lvm lvcreate VolGroup00 -n LogVol02 -L 256M
OR
OR
lvcreate VolGroup00 -n LogVol02 -L 256M
mkswap /dev/VolGroup00/LogVol02
/etc/fstab file entry for boot time swap loading
/dev/VolGroup00/LogVol02 swap swap defaults 0 0
enable swap space
swapon -va
check swap space
cat /proc/swaps
OR
free
Remove the Logical Volume for Swap
swapoff -v /dev/VolGroup00/LogVol02
lvm lvremove /dev/VolGroup00/LogVol02
remove the entry from /etc/fstab
cat /proc/swaps
OR
free
Extend Swap on Logical Volume
Disable Swapping for that Logical Volume
swapoff -v /dev/VolGroup00/LogVol01
Resize the Logical Volume
lvm lvresize /dev/VolGroup00/LogVol01 -L +256M
Format the new Swap Space
mkswap /dev/VolGroup00/LogVol01
Enable the Extended Logical Volume
swapon -va
Test the Swap
cat /proc/swaps
OR
free
Reduce Swap on a Logical Volume
swapoff -v /dev/VolGroup00/LogVol01
lvm lvreduce /dev/VolGroup00/LogVol01 -L -512M
mkswap /dev/VolGroup00/LogVol01
swapon -va
cat /proc/swaps
OR
free