Swap extension in
linux can be done in two ways.
a) By creating a file
b) By creating a disk
We will see the steps for both the methods.
We will see the steps for both the methods.
a) By creating a disk
a.1 Extend SWAP with the existing LVM
To extend an LVM2
swap logical volume (assuming /dev/VolGroup00/LogVol01 is the volume you want
to extend):
(i) Disable swap for
the associated logical volume:
# swapoff -v
/dev/VolGroup00/LogVol01
(ii) Resize the LVM2 logical volume by 256 MB:
# lvresize
/dev/VolGroup00/LogVol01 -L +256M
(iii) Format the new swap space:
# mkswap
/dev/VolGroup00/LogVol01
(iv) Enable the extended logical volume:
# swapon -va
(v) Test that the logical volume has been extended properly:
# cat /proc/swaps #
free
a.2 Extend SWAP by Creating a new LVM
To add a swap volume
group (assuming /dev/VolGroup00/LogVol02 is the swap volume you want to add):
(i) Create the LVM2
logical volume of size 256 MB:
# lvm lvcreate
VolGroup00 -n LogVol02 -L 256M
(ii) Format the new swap space:
# mkswap
/dev/VolGroup00/LogVol02
(iii) Add the following entry to the /etc/fstab file:
/dev/VolGroup00/LogVol02 swap
swap defaults 0 0
# swapon -va
Test that the logical
volume has been extended properly. Above command will enable the extended logical volume:
# cat /proc/swaps #
free
b) By creating a Swap File
Determine the size of
the new swap file in megabytes and multiply by 1024 to determine the number of
blocks. For example, the block size of a 64 MB swap file is 65536.
(i) dd if=/dev/zero
of=/swapfile bs=1024 count=65536
Setup the swap file
with the command:
(ii) mkswap /swapfile
To enable the swap
file immediately but not automatically at boot time:
(iii) swapon /swapfile
To enable it at boot
time, edit /etc/fstab to include the following entry:
