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 9:36 AM 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 *Dép. Réseaux Informatiques & Télécoms* *IUT1 - Univ GRENOBLE Alpes* *0476824462* Stages, Alternance, Emploi.