The virtual size of thin logical volumes can exceed the physical capacity of the thin pool resulting in over-provisioning. To prevent running out of space, you must monitor and periodically extend the capacity of the thin pool.

The data_percent metric indicates the percentage of the allocated data space that the thin pool currently uses. The metadata_percent metric reflects the percentage of space used for storing metadata, which is essential for managing the mappings within the thin pool.

Monitoring these metrics is vital to ensure efficient storage management and to avoid capacity issues.

LVM provides the option to manually extend the data or metadata capacity as needed. Alternatively, you can enable monitoring and automate the expansion of your thin pool.