LVM thinpool mapped size is larger than disk size

[Dino.]

After reducing the volume gives the following warning:

lvs

WARNING: Thin volume pve/vm-106-disk-0 maps <243.13 GiB while the size is only 50.00 GiB.

LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
data pve twi-aotz-- 54.42t 0.79 0.64
root pve -wi-ao---- 96.00g
snap_vm-105-disk-0_prueba pve Vri---tz-k 250.00g data vm-105-disk-0
swap pve -wi-ao---- 8.00g
vm-100-disk-0 pve Vwi-aotz-- 20.00g data 28.91
vm-102-disk-0 pve Vwi-aotz-- 100.00g data 98.34
vm-106-disk-0 pve Vwi-a-tz-- 50.00g data 100.00


How the mapping size can be compacted?

 

[Richard]

After reducing the volume gives the following warning:

lvs

WARNING: Thin volume pve/vm-106-disk-0 maps <243.13 GiB while the size is only 50.00 GiB.

LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
data pve twi-aotz-- 54.42t 0.79 0.64
root pve -wi-ao---- 96.00g
snap_vm-105-disk-0_prueba pve Vri---tz-k 250.00g data vm-105-disk-0
swap pve -wi-ao---- 8.00g
vm-100-disk-0 pve Vwi-aotz-- 20.00g data 28.91
vm-102-disk-0 pve Vwi-aotz-- 100.00g data 98.34
vm-106-disk-0 pve Vwi-a-tz-- 50.00g data 100.00


How the mapping size can be compacted?

If it's a Linux guest run

 fstrim -v /

inside the guest. See also remarks "trim/discard" in chapter 10.2.4 of https://pve.proxmox.com/pve-docs/pve-admin-guide.html#qm_virtual_machines_settings