Posts tagged vgchange

LVM: shrink volume

posted on 2015-08-07 18:34:25

To shrink a LVM partition, there are several steps to be reproduced:

  • the volume has to be unmounted
  • activate the LVM volumes, so linux can handle them
  • check that the filesystem is error free
  • shrink filesystem, a little more than needed
  • shrink LVM partition
  • expand filesystem to full LVM partition size
  • fsck again, if you are anxious :)

If the volume is mounted, you will not be able to filesystem-check it, or even shrink it. So you can not simply shrink the root partition of your running live system. For this you will need a live disk (google for 'grml linux') and boot from this to make the changes.

So here something to copy paste from:

vgchange -a y
e2fsck -f /dev/<volume_group>/<logical_volume>
resize2fs /dev/<volume_group>/<logical_volume> <size-in-GB-MINUS-1GB>G
lvreduce -L <size-in-GB>G /dev/<volume_group>/<logical_volume>
resize2fs /dev/<volume_group>/<logical_volume>
e2fsck -f /dev/<volume_group>/<logical_volume>

Voila.

Usually you'd want to do this in order to create another volume / partition, but this is stuff for another blogpost.

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