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Shrink LVM without data loss


assume we have 3 logical volume: lv1 40GB, lv2 8GB, lv3 200GB in volume group called data. we want to resize lv3 become 180GB. here is the steps:
  • booting to single mode
  • enter init 1 (type: init 1)
  • umount logical volume that you want to resize, e.g. umount /dev/data/lv3
  • check the filesystem: e2fsck -f /dev/data/lv3
  • resize the filesystem: resize2fs -p /dev/data/lv3 180G
  • lvreduce -L -20G /dev/data/lv3
Ref: askubuntu.com

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