ØCreating
an LVM2 Logical Volume for Swap:
To add a swap
volume group (assuming /dev/VolGroup00/LogVol02 is the swap volume you want to
add):
1.
Create the LVM2 logical volume of size 256 MB:
#
lvm lvcreate VolGroup00 -n LogVol02 -L 256M
2.
Format the new swap space:
#
mkswap /dev/VolGroup00/LogVol02
3.
Add the following entry to the /etc/fstab file:
/dev/VolGroup00/LogVol02 swap swap defaults 0 0
4.
Enable the extended logical volume:
#
swapon -va
5.
Test that the logical volume has been extended
properly:
#
cat /proc/swaps # free
Ø Extending
Swap on an LVM2 Logical Volume:
To extend an LVM2 swap logical
volume (assuming /dev/VolGroup00/LogVol01 is the volume you want to extend):
1.
Disable swapping for the associated logical
volume:
#
swapoff -v /dev/VolGroup00/LogVol01
2.
Resize the LVM2 logical volume by 256 MB:
#
lvm lvresize /dev/VolGroup00/LogVol01 -L +256M
3.
Format the new swap space:
#
mkswap /dev/VolGroup00/LogVol01
4.
Enable the extended logical volume:
#
swapon -va
5.
Test that the logical volume has been extended
properly:
# cat /proc/swaps
# free
Ø To
add 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.
1.
At a shell prompt as root, type the following
command with count being equal to the desired block size:
dd if=/dev/zero of=/swapfile bs=1024 count=65536
2.
Setup the swap file with the command:
mkswap /swapfile
3.
To enable the swap file immediately but not
automatically at boot time:
swapon /swapfile
4.
To enable it at boot time, edit /etc/fstab to
include the following entry:
/swapfile swap swap defaults 0 0
5.
The next time the system boots, it enables the
new swap file.
6.
After adding the new swap file and enabling it,
verify it is enabled by viewing the output of the command cat /proc/swaps or free.
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