Sorry, I meant to reply-all, to Strahil's most recent message.
So I'm doing so now.
In addition to my comments below, this StackOverflow thread summarizes what I have in mind:
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On Friday, April 16, 2021 5:33 AM, David White <
dmwhite823@protonmail.com> wrote:
> I don't think I would have the capability to take on the expense of adding two more servers to my environment, on top of the 4th server I already have, right now.
>
> I realize the following isn't recommended, but would it be possible to, instead, intentionally degrade the gluster cluster by shutting 1 of the hosts down (put it in maintenance mode), add storage, and bring it back online?
>
> Perhaps that would be a better approach, rather than try to shift things around with a 4th server.
>
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> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
> On Thursday, April 15, 2021 7:36 PM, Strahil Nikolov
hunter86_bg@yahoo.com wrote:
>
> > Gluster allows converting from replicted to distributed-replicated (so called expansion) of the volume.
> > Of course you need to add the same amount of bricks as the replica count (which should be either 'replica 3' or 'replica 3 arbiter 1').
> > The Gluster documentation on the topic is quite extensive , but it's worth mentioning that you need to 'rebalance' your cluster after the expansion or you risk filling the old bricks - while having free space on the new bricks.
> > That is expected ,as each file/dir's name is hashed and each subvolume (new vs old bricks) will have it's own range of hashes. When you expand the volume, some of the files/dirs on the old bricks have hashes that match to the new "triplet".
> > Also , if you do not rebalance - that will have some performance impact as gluster will search the new bricks (for the files' whose hash matches the new subvolume) before searching the old bricks.
> > P.S: I think that the Engine's web interface fully supports that operation, although I'm used to the cli.
> > Best Regards,
> > Strahil Nikolov
> > В четвъртък, 15 април 2021 г., 20:05:50 ч. Гринуич+3, David White via Users
users@ovirt.org написа:
> > Is it possible to expand an existing gluster volume?
> > I have a hyperconverged environment, and have enough space right now, but I'm going to have to significantly over-provision my environment. The vast majority of our customers are using a small fraction of the amount of space that they are technically allocated, but we still need to make that space available to them.
> > As a result, I'd like to plan ahead, and go ahead and have a plan to add storage later down the road.
> > I'd like to plan to shut down each server in the cluster (individually, not at once), add storage, and then bring them back online. Once all 3 are back online with the additional storage, I'd like to expand the gluster volume to use the additional space. Is that possible? How?
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