In terms of Hyperconverged environments. OpenstackHelm is a good candidate if you want to do it.

 

--Karl.

 

From: Laurent Dumont <laurentfdumont@gmail.com>
Date: Tuesday, 12 March 2024 at 2:19 pm
To: Franck VEDEL <franck.vedel@univ-grenoble-alpes.fr>
Cc: openstack-discuss@lists.openstack.org <openstack-discuss@lists.openstack.org>
Subject: Re: Questi

Bonjour Franck!

 

It would be interesting to narrow down where you are reaching the limits of Openstack :

  • Are you running out of vCPU/RAM due to too many VMs?
    • Are you seeing CPU steal time due to oversubscribing the hosts?
    • Are the VMs oversized?
  • Are you running out of capacity on the network side?
  • Are you running out of capacity on the storage side?
  • Is the Openstack control plane reaching its limits?
    • That would be surprising considering the amount of computes you have.

At such a "small" scale, some of the Openstack overhead might be tricky to deal with.

  • Running Controllers + Compute + Storage on the same server typically means a "hyperconverged" setup.
  • I am not sure if there are community run deployments that will support it out of the box. It's typically complex to deploy/support/maintain and part of a commercial support package.

Have you looked at other virtualization platforms like Proxmox? 

 

 

On Thu, Mar 7, 2024 at 9:36AM Franck VEDEL <franck.vedel@univ-grenoble-alpes.fr> wrote:

Good morning,

I currently have an Openstack cluster made up of 3 nodes, an iscsi bay (10T), 576 G of Ram, 10T, 288vcpus. 

This cluster is used by around 150 students, but is reaching its limits.

Having obtained a budget to set up a larger cluster, I am wondering about the choice of the number of nodes, their role (how many controllers, network, compute, etc.) and above all what solution for storage.

Let's imagine a budget to buy 6 servers with good capacities, is the right choice Ceph storage (with cinder and rdb?) on the Openstack cluster nodes? Do we need 3 servers for a Ceph cluster and 3 for the Openstack part (in this case I lose capacity for the "compute" part)... I don't know what the right choices are and above all, I have a little afraid of going in the wrong directions.

Could any of you guide me, or give me links to sites that could help me (and that I haven't seen).

Thanks in advance

 

Franck VEDEL

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