LVM Extend and Shrink Commands in RHEL

To shrink:

  df -h
  umount /dev/mapper/vg_blrws197-lv_home
  e2fsck -ff  /dev/mapper/vg_blrws197-lv_home
  resize2fs /dev/mapper/vg_blrws197-lv_home 5GB
  resize2fs /dev/mapper/vg_blrws197-lv_home 5G
  lvreduce -L -397G /dev/mapper/vg_blrws197-lv_home
  mount /dev/mapper/vg_blrws197-lv_home /home


To Extend:

  df -h
  pvs
  vgdisplay
   lvextend -l +102912 /dev/mapper/vg_blrws197-lv_root
  resize2fs /dev/mapper/vg_blrws197-lv_root