How can I reduce or shrink the size of a GFS or GFS2 filesystem on RHEL 5,6,7,8?

Solution Verified - Updated -

Environment

  • Red Hat Enterprise Linux Server 5,6,7,8 (with the High Availability and Resilient Storage Add Ons)

Issue

  • How can I reduce or shrink the size of a GFS or GFS2 filesystem?
  • How to resize a GFS2 filesystem to a lower size?

Resolution

A GFS or GFS2 cannot be shrunk to a smaller size. There is no supported tool that will shrink a GFS or GFS2 filesystem after it is created with mkfs.gfs2.

  • The only way to decrease a GFS or GFS2 filesystem is to do the following;
    • Create a new GFS or GFS2 filesystem to your preferred size.
    • Copy the contents of the original GFS or GFS2 filesystem to the new GFS or GFS2 filesystem.

Root Cause

  • Red Hat Enterprise Linux does not provide a command which can be used to reduce the size of a GFS or GFS2 filesystem.

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