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Cluster Sizing
This reference architecture is well suited for production-grade OpenStack deployments on a medium and large scale when you can afford allocating several servers for your OpenStack controller nodes in order to build a fully redundant and highly available environment.
The absolute minimum requirement for a highly-available OpenStack deployment is to allocate 4 nodes:
- 3 controller nodes, combined with storage
- 1 compute node
If you want to run storage separately from the controllers, you can do that as well by raising the bar to 7 nodes:
- 3 controller nodes
- 3 storage nodes
- 1 compute node
Of course, you are free to choose how to deploy OpenStack based on the amount of available hardware and on your goals (such as whether you want a compute-oriented or storage-oriented cluster).
For a typical OpenStack compute deployment, you can use this table as high-level guidance to determine the number of controllers, compute, and storage nodes you should have:
| # of Machines | Controllers | Compute | Storage |
|---|---|---|---|
| 4-10 | 3 | 1-7 | on controllers |
| 11-40 | 3 | 5-34 | 3 (separate) |
| 41-100 | 4 | 31-90 | 6 (separate) |
| >100 | 5 | >86 | 9 (separate) |