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13.3. Creating an LVM2 logical volume for swap

You can create an LVM2 logical volume for swap. Assuming /dev/VolGroup00/LogVol02 is the swap volume you want to add.

Prerequisites

  • You have enough disk space.

Procedure

  1. Create the LVM2 logical volume of size 4 GB: 

    # lvcreate -n LogVol02 -L 4G VolGroup00

  2. Format the new swap space: 

    # mkswap /dev/VolGroup00/LogVol02

  3. Add the following entry to the /etc/fstab file: 

    /dev/VolGroup00/LogVol02 none swap defaults 0 0

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

    # systemctl daemon-reload

  5. Activate swap on the logical volume: 

    # swapon -v /dev/VolGroup00/LogVol02

Verification

  • To test if the swap logical volume was successfully created and activated, inspect active swap space by using the following command: 

    # cat /proc/swaps
Filename               Type        Size         Used        Priority
/dev/dm-6         partition     4194300            0              -2
     
    # free -h
               total        used        free      shared  buff/cache   available
Mem:            30Gi       1.2Gi        28Gi        12Mi       995Mi        28Gi
Swap:          4.0Gi          0B       4.0Gi
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