LVM2: Setting Snapshots to Auto-Extend With a Threshold Setting

Case: Forced to use LVM2 snapshots as a backup solution since the OS installed as LVM instead of regular partitions.

Solution

1. sudo su
2. nano /etc/lvm/lvm.conf
3. Ctrl+W for: snapshot_autoextend_threshold
4. Set this to appropriate value (ex: 98)
5. Ctrl+W for: snapshot_autoextend_percent
6. Set this to appropriate value (ex: 20)
7. Save with Ctrl+O

Reference

• Linux lvm snapshot backup and restore tutorial RHEL/CentOS 7/8 | GoLinuxCloud