Appendix A. Additional information

download PDF

A.1. Configuration guidance

The following configuration guidance is intended to provide a framework for creating Hyperconverged Infrastructure environments. This guidance is not intended to provide definitive configuration parameters for every Red Hat OpenStack Platform installation. Contact the Red Hat Customer Experience and Engagement team for specific guidance and suggestions that fit your specific environment.

A.1.1. Cluster sizing and scale out

The Red Hat Ceph Storage Hardware Guide provides recommendations for IOPS optimized, throughput optimized, and cost and capacity optimized Ceph deployment scenarios. Follow the recommendation that best represents your deployment scenario and add the NICs, CPUs, and RAM required to support the Compute workload.

An optimal, small footprint configuration consists of seven nodes. Unless you have a requirement for IOPS optimized performance in your environment and you are using all flash storage, the throughput optimized deployment scenario should be used.

Three node Ceph Storage cluster configurations are possible. In this configuration, you should:

  • use all flash storage.
  • set the replica_count parameter to 3 in the ceph.conf file.
  • set the min_size parameter to 2 in the ceph.conf file.

If a node leaves service in this configuration, IOPS continue. To retain 3 copies of the data, replication to the third node is queued until it returns to service. Data is then backfilled to the third node.


HCI configurations of up to 64 nodes have been tested. Some HCI environment examples have been documented up to 128 nodes. Large clusters such as these can be considered with a Support Exception and Consulting Services engagement. Contact the Red Hat Customer Experience and Engagement team for guidance.

A deployment with two NUMA nodes can host a latency sensitive Compute workload on one NUMA node and Ceph OSDs services on the other. If there are network interfaces on both nodes, and the disk controllers are on node 0, use a network interface on node 0 for the Storage network and host the Ceph OSD workload on node 0. Host the Compute workload on node 1 and configure it to use the network interfaces on node 1. When acquiring hardware for your deployment, be mindful of which NICs will use which nodes and attempt to split them between storage and workload.

A.1.2. Capacity planning and sizing

The throughput optimized Ceph solution defined in the Red Hat Ceph Storage Hardware Guide provides a balanced solution for most deployments that do not require optimization for IOPS. In addition to the configuration guidelines provided with the solution, note the following when creating your environment:

  • The allotment of 5 GB of RAM per OSD ensures OSDs have sufficient operational memory. Ensure your hardware can support this requirement.
  • CPU speed should match the storage medium in use. The advantages of faster storage mediums such as SSDs can be negated by CPUs too slow to support them. Similarly, a fast CPU can be more efficiently used by faster storage mediums. Balance CPU and storage medium speed so that neither becomes a bottleneck for the other.

A.2. Guides and resources for the configuration of your hyperconverged infrastructure environment

The following guides contain additional information and procedures that can aid in the configuration of your hyperconverged infrastructure environment.

  • Deploying Red Hat Ceph and OpenStack together with director

    • This guide provides information about using the Red Hat OpenStack Platform director to create an overcloud with a Red Hat Ceph Storage cluster. This includes instructions for customizing your Ceph cluster through the director.
  • Installing and managing Red Hat OpenStack Platform with director

    • This guide provides guidance on the end-to-end deployment of a Red Hat OpenStack Platform environment. This includes installing the director, planning your environment, and creating an OpenStack environment with the director.
  • Configuring Red Hat OpenStack Platform networking

    • This guide provides details on Red Hat OpenStack Platform networking tasks.
  • Configuring persistent storage

    • This guide details the different procedures for using and managing persistent storage in a Red Hat OpenStack Platform environment. It also includes procedures for configuring and managing the respective OpenStack service of each persistent storage type.
  • Configuring the Bare Metal Provisioning service

    • This guide provides details on the installation and configuration of the Bare Metal Provisioning service in the overcloud of a Red Hat OpenStack Platform environment to provision and manage physical machines for cloud users.
  • Hardening Red Hat OpenStack Platform

    • This guide provides good practice advice and conceptual information about hardening the security of a Red Hat OpenStack Platform environment.
  • Release Notes

    • This document outlines the major features, enhancements, and known issues in this release of Red Hat OpenStack Platform.
Red Hat logoGithubRedditYoutubeTwitter


Try, buy, & sell


About Red Hat Documentation

We help Red Hat users innovate and achieve their goals with our products and services with content they can trust.

Making open source more inclusive

Red Hat is committed to replacing problematic language in our code, documentation, and web properties. For more details, see the Red Hat Blog.

About Red Hat

We deliver hardened solutions that make it easier for enterprises to work across platforms and environments, from the core datacenter to the network edge.

© 2024 Red Hat, Inc.