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Chapter 9. Freeing space on thinly-provisioned logical volumes using fstrim
You can manually run fstrim to return unused logical volume space to the thin pool, which can be available for other logical volumes.
Red Hat recommends running fstrim daily.
Prerequisites
Verify that the thin pool logical volume supports discard behavior.
Discard is supported if the output of the following command for the underlying device is not zero.
# cat /sys/block/<device>/queue/discard_max_bytes
NoteIf
discard_max_bytesreturns 0, you can still execute thefstrimcommand on the thin logical volume to reclaim unused blocks to the thin pool. However, thediscardortrimwill not be passed down to the block layer.
Procedure
Run
fstrimto restore physical space to the thin pool.# fstrim -v <mountpoint>
For example, the following command discards any unused space it finds on the logical volume mounted at
/gluster_bricks/data/data, and provides verbose output (-v).# fstrim -v /gluster_bricks/data/data
