Synology Shrink Volume

Synology DSM 7 does not expose the functionality to shrink volumes within the GUI. It is definitely possible and must be done via SSH as the root user or sudo.

sudo btfrs filesystem resize -- -1024G /volume1
sudo lvm lvreduce -L -1024G /dev/mapper/vg-volume1

DSM should pickup that the volume changed sizes and allow you to extend another volume.

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