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To discard unused blocks on a mounted file system
# fstrim -v /
# fstrim -v /var
# fstrim -v /home
203475: Samsung 860 EVO queued TRIM issues - Kernel.org Bugzilla
201693: Samsung 860 EVO NCQ Issue with AMD SATA Controller - Kernel.org Bugzilla
Recommended the following "fix":
# echo 1 > /sys/block/sda/device/queue_depth
# echo max_performance > /sys/class/scsi_host/host*/link_power_management_policy