shrink lvm volume group

[molnart]

I need to move my pve system disk containing the lvm-thin folder to a smaller drive. the volume group has sufficient unallocated space, however i need to shrink the actual partition, so that clonezilla is able to process the move.

this is how my volume group looks like. i need to save up approx. 30 gigs of data from the 150 GiB unallocated space. most topic here cover using the unallocated space for a new volume group and that did not help me.

root@pve:~# vgdisplay
  --- Volume group ---
  VG Name               pve
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  1053
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                14
  Open LV               3
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <488.55 GiB
  PE Size               4.00 MiB
  Total PE              125068
  Alloc PE / Size       86785 / 339.00 GiB
  Free  PE / Size       38283 / 149.54 GiB
  VG UUID               LMrk1p-Bcwg-ax0v-6meq-DMEQ-bifV-nk2fzn