[Gluster-users] Gluster Rebalance question

[Strahil Nikolov]

Hi Patrick,

I don't think you need rebalance, just ensure that all bricks have the same size.
Take a look in RH documention[1] and this old article [2] for more details.
Best Regards,Strahil Nikolov


[1] https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.5/html/administration_guide/sect-rebalancing_volumes[2] https://staged-gluster-docs.readthedocs.io/en/release3.7.0beta1/Features/rebalance/


  On Tue, Mar 12, 2024 at 15:43, Patrick Dijkgraaf<bolderbast at duckstad.net> wrote:   Hi all,

I'm using glusterfs for a few years now, and generally very happy with it. Saved my data multiple times already! :-)
However, I do have a few questions for which I hope someone is able to answer them.

I have a distributed, replicated glusterfs setup. I am in the process of replacing 4TB bricks with 8TB bricks, which is working nicely. However, what I am seeing now is that the space usage of the replaced bricks is way lower than the rest. 45% vs. 90%, which makes sense because the disk is now twice as large.

As I understand it, this won't balance out automatically and I need to run a rebalance process to ditribute the data evenly across the bricks.
    
   - What does the "fix-layout" option do exactly? Does it only correct/adjust gluster metadata, meaning it should be finished quite quickly?
   - Would the "fix-layout" option be required in this scenario? I know it is required when adding/removing bricks. But in my scenario the amount of bricks has stayed the same, only the size has changed.
   - Will the rebalance read/write all data, or only the data that is causing the imbalance (only moving the excess data on the fuller bricks to the lesser-full bricks).
   - What does the "force" option do exactly? I read something about link files and performance impact if you do not use the "force" option.
   - Should I use the "force" option in my scenario, or not?

Thanks in advance!

-- 
Groet / Cheers,
Patrick Dijkgraaf________



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