How To: Shrink (Reduce) a ReiserFS formatted LVM partition

1. Umount the part it ion you want to shrink

umount /opt

2. Resize the ReiserFS filesystem on the affected partition

resize_reiserfs –s -1G /dev/vgroot/lvopt

3. Shrink the LV part it ion

lvreduce –L -1GB /dev/vgroot/lvopt

4. Mount the part it ion again

Mount /dev/vgroot/lvopt /opt

5. done :-)