15.2. Removing Swap Space

Procedure 15.3. Reducing an LVM2 Swap Logical Volume

1. Disable swapping for the associated logical volume:

   # swapoff -v /dev/VolGroup00/LogVol01

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2. Reduce the LVM2 logical volume by 512 MB:

   # lvreduce /dev/VolGroup00/LogVol01 -L -512M

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3. Format the new swap space:

   # mkswap /dev/VolGroup00/LogVol01

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4. Activate swap on the logical volume:

   # swapon -v /dev/VolGroup00/LogVol01

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5. To test if the swap logical volume was successfully reduced, inspect active swap space:

   $ cat /proc/swaps
   $ free -h

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Procedure 15.4. Remove a Swap Volume Group

1. Disable swapping for the associated logical volume:

   # swapoff -v /dev/VolGroup00/LogVol02

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2. Remove the LVM2 logical volume:

   # lvremove /dev/VolGroup00/LogVol02

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3. Remove the following associated entry from the /etc/fstab file:

   /dev/VolGroup00/LogVol02   swap     swap    defaults     0 0

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4. Regenerate mount units so that your system registers the new configuration:

   # systemctl daemon-reload

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5. Remove all references to the removed swap storage from the /etc/default/grub file:

   # vi /etc/default/grub

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6. Rebuild the grub configuration:
   1. on BIOS-based machines, run:

      # grub2-mkconfig -o /boot/grub2/grub.cfg

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   2. on UEFI-based machines, run:

      # grub2-mkconfig -o /boot/efi/EFI/redhat/grub.cfg

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7. To test if the logical volume was successfully removed, inspect active swap space:

   $ cat /proc/swaps
   $ free -h

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Procedure 15.5. Remove a Swap File

1. At a shell prompt, execute the following command to disable the swap file (where /swapfile is the swap file):

   # swapoff -v /swapfile

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2. Remove its entry from the /etc/fstab file.
3. Regenerate mount units so that your system registers the new configuration:

   # systemctl daemon-reload

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4. Remove the actual file:

   # rm /swapfile

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