Just a thought but depending on resources you might be able to use your 4th server as nfs storage and live migrate vm disks to it and off of your gluster volumes. I’ve done this in the past when doing major maintenance on gluster volumes to err on the side of caution. 

On Sat, Jul 10, 2021 at 7:22 AM David White via Users <users@ovirt.org> wrote:
Hmm.... right as I said that, I just had a thought.
I DO have a "backup" server in place (that I haven't even started using yet), that currently has some empty hard drive bays.

It would take some extra work, but I could use that 4th backup server as a temporary staging ground to begin building the new Gluster configuration. Once I have that server + 2 of my production servers rebuilt properly, I could then simply remove and replace this "backup" server with my 3rd server in the cluster.

So this effectively means that I have 2 servers that I can take down completely at a single time to rebuild gluster, instead of just 1. I think that simplifies things.

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On Saturday, July 10th, 2021 at 6:14 AM, David White <dmwhite823@protonmail.com> wrote:
Thank you. And yes, I agree, this needs to occur in a maintenance window and be done very carefully. :)

My only problem with this method is that I need to *replace* disks in the two servers.
I don't have any empty hard drive bays, so will effectively need to put a host into maintenance mode, remove the drives, and put new drives in.

I will NOT be touching the OS drives, however, as those are on their own separate RAID array. 

So, essentially, it will need to look something like this:
  • Put the cluster into global maintenance mode
  • Put 1 host into full maintenance mode / deactivate it
  • Stop gluster
  • Remove the storage
  • Add the new storage & reconfigure
  • Start gluster
  • Re-add the host to the cluster
Adding the new storage & reconfiguring is the head scratcher for me, given that I don't have room for the old hard drives + new hard drives at the same time.

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On Saturday, July 10th, 2021 at 5:55 AM, Strahil Nikolov <hunter86_bg@yahoo.com> wrote:
Hi David,


any storage operation can cause unexpected situations, so always plan your activites for low traffic hours and test them on your test environment in advance.

I think it's easier if you (command line):

-verify no heals are pending. Not a single one.
- set the host to maintenance over ovirt
- remove the third node from gluster volumes (remove-brick replica 2)
- umount the bricks on the third node
- recreate a smaller LV with '-i maxpct=90 size=512' and mount it with the same options like the rest of the nodes. Usually I use 'noatime,inode64,context=system_u:object_r:glusterd_brick_t:s0'
- add this new brick (add-brick replica 3 arbiter 1) to the volume
- wait for the heals to finish

Then repeat again for each volume.


Adding the new disks should be done later.


Best Regards,
Strahil Nikolov

On Sat, Jul 10, 2021 at 3:15, David White via Users
My current hyperconverged environment is replicating data across all 3 servers.
I'm running critically low on disk space, and need to add space.

To that end, I've ordered 8x 800GB ssd drives, and plan to put 4 drives in 1 server, and 4 drives in the other.

What's my best option for reconfiguring the hyperconverged cluster, to change gluster storage away from Replica 3 to a Replica 2 / Arbiter model?
I'd really prefer not to have to reinstall things from scratch, but I'll do that if I have to.

My most important requirement is that I cannot have any downtime for my VMs (so I can only reconfigure 1 host at a time).

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