Resized container disk no space released

Hi,
Assuming you're using an lvm-thin storage device, shrinking a disk won't affect the storage usage. LVM-thin devices only allocate blocks of storage when they're written [1], so when you create the initial container, whether it's 8Gb or 80Gb, only a couple of hundred megabytes will be reported as used. If proxmox reports more storage usage than the container is using, you could try running pct fstrim <vmid> to discard unused blocks in the container.

[1] https://pve.proxmox.com/pve-docs/pve-admin-guide.html#storage_lvmthin
 
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