Reducing Swap On An Lvm2 Logical Volume; Removing An Lvm2 Logical Volume For Swap - Red Hat ENTERPRISE LINUX 5 - DEPLOYMENT Deployment Manual

Chapter 5. Swap Space
You have three options: remove an entire LVM2 logical volume used for swap, remove a swap file, or
reduce swap space on an existing LVM2 logical volume.

5.3.1. Reducing Swap on an LVM2 Logical Volume

To reduce an LVM2 swap logical volume (assuming /dev/VolGroup00/LogVol01 is the volume
you want to reduce):
1. Disable swapping for the associated logical volume:
# swapoff -v /dev/VolGroup00/LogVol01
2. Reduce the LVM2 logical volume by 512 MB:
# lvm lvreduce /dev/VolGroup00/LogVol01 -L -512M
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 reduced properly:
# cat /proc/swaps # free

5.3.2. Removing an LVM2 Logical Volume for Swap

The swap logical volume cannot be in use (no system locks or processes on the volume). The easiest
way to achieve this it to boot your system in rescue mode. Refer to for instructions on booting into
rescue mode. When prompted to mount the file system, select Skip.
To remove a swap volume group (assuming /dev/VolGroup00/LogVol02 is the swap volume you
want to remove):
1. Disable swapping for the associated logical volume:
# swapoff -v /dev/VolGroup00/LogVol02
2. Remove the LVM2 logical volume of size 512 MB:
# lvm lvremove /dev/VolGroup00/LogVol02
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