I wanted to carve out a separate volume for some other use so I needed to shrink this data volume:
First, I unmounted the logical volume with:
umount /var/lib/vzThen I proceeded to shrink the file system to the minimum size possible with:
resize2fs -Mf /dev/pve/dataThen I proceeded to reduce the size of the logical volume with:
lvreduce --verbose --extents -100000 /dev/pve/dataThen I proceeded to grow the file system back to occupy the now reduced volume with:
resize2fs -f /dev/pve/dataLastly, I remounted the file system with:
mount /dev/pve/data /var/lib/vz
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