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.

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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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