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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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
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

<users@ovirt.org> wrote:

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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