The Gluster Blog

Gluster blog stories provide high-level spotlights on our users all over the world

Integration with KVM/QEMU


By now, you may have heard about the recent work being done to integrate GlusterFS with QEMU. The engineers at IBM’s Linux Technology Center in Bangalore deserve a lot of credit for their work here. Bharata Rao, Deepak Shetty and Mohan Kumar have been hard at work implementing a GlusterFS device driver for QEMU that bypasses FUSE, talking directly to GlusterFS via a new client library, libgfapi. This is truly exciting stuff, and one of the things that will make GlusterFS 3.4 a significant advance for anyone with scale-out, virtualized environments.

Bharata Rao wrote a quite informative blog post on the subject, relating how they were solving the problem and what performance gains could be expected. The difference in performance is quite striking, with almost 3x improvement in sequential reads and almost 2x improvement in sequential writes. This is pretty significant and will, we hope, convince more users to go big with GlusterFS.

QEMU + GlusterFS Diagram

If you want to try out the new code, you’ll have to check out the latest master branch for GlusterFS from our git repo and download the release candidate for QEMU 1.3. You’ll also need the most recent version of libvirt. Expect a beta release of GlusterFS 3.4 in the near future. QEMU 1.3 is targeted for release in December, and GlusterFS 3.4 should be out in January.

For more information on the subject, see Mohan’s abstract from LinuxCon Europe and Bharata Rao’s slides and YouTube tutorials.

Highly recommended: read Bharata Rao’s comprehensive blog post.


  • 06 Dec 2020
    Looking back at 2020 – with g...

    2020 has not been a year we would have been able to predict. With a worldwide pandemic and lives thrown out of gear, as we head into 2021, we are thankful that our community and project continued to receive new developers, users and make small gains. For that and a...

    Read more
  • 27 Apr 2020
    Update from the team

    It has been a while since we provided an update to the Gluster community. Across the world various nations, states and localities have put together sets of guidelines around shelter-in-place and quarantine. We request our community members to stay safe, to care for their loved ones, to continue to be...

    Read more
  • 03 Feb 2020
    Building a longer term focus for Gl...

    The initial rounds of conversation around the planning of content for release 8 has helped the project identify one key thing – the need to stagger out features and enhancements over multiple releases. Thus, while release 8 is unlikely to be feature heavy as previous releases, it will be the...

    Read more