On Fri, Jul 6, 2018 at 5:37 PM, Sandro Bonazzola <sbonazzo@redhat.com> wrote:

2018-07-05 13:16 GMT+02:00 Leo David <leoalex@gmail.com>:

Hello everyone,

I have two things that i really need to understand regarding storage scaling using gluster.

Basically, I am trying to figure out a way to go from 1 single instance to multiple nodes cluster.

1. Single node SelfHosted Engine HyperConverged setup - scale instance up to 3 nodes:

- the gluster volumes are created as distributed type.

- is there a procedure to migate this single-host scenario to multiple nodes, considering that the 3 nodes setup is using replica 3 gluster volumes ?

Sahina, a quick check on the oVirt website didn't help me finding the documentation for Leo.

Can you please assist?

To move from a single host to multiple host, you can add additional hosts to your cluster via Ovirt. Distribute volume can be changed to a replica 3 volume - but ensure there's no ongoing I/O. The easier process is to add new replica 3 volumes and move your VM disks to it - for the VMs that require HA.

 

2. 3 Nodes SelfHosted Engine - add more storage nodes

- how should I increase the size of the already present replica 3 volumes ?

- should the volumes be as distribute-replicated in an environment larger than 3 nodes ?

Couldn't find documentation on ovirt.org site, but this should apply to your case: https://access.redhat.com/documentation/en-us/red_hat_hyperconverged_infrastructure/1.1/html/maintaining_red_hat_hyperconverged_infrastructure/scaling#scaling_rhhi_by_adding_additional_volumes_on_new_nodes

Sahina, can you help preparing some documentation for ovirt.org as well?

Sure, contributions are welcome though - Leo, if you feel like pitching in

 

3. Is there a limit as a maximum number of compute nodes per cluster ?

I'm not aware of limits but according to above document I won't go over the 9 nodes in this configuration.

 

Thank you very much !

Leo

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Best regards, Leo David

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SANDRO BONAZZOLA

MANAGER, SOFTWARE ENGINEERING, EMEA R&D RHV

Red Hat EMEA

sbonazzo@redhat.com