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Chapter 2. Identify your Use Case

This chapter provides a brief introduction of the two use cases available in Containerized Red Hat Gluster Storage.

Note

Red Hat Openshift Container Storage does not support a simultaneous deployment of converged and independent mode with ansible workflow. Therefore, you must deploy either converged mode or independent mode: you cannot mix both modes during deployment.

2.1. Converged Mode
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Note

Converged mode was earlier called as Container-Native Storage.
This deployment delivers a hyper-converged solution, where the storage containers that host Red Hat Gluster Storage co-reside with the compute containers and serve out storage from the hosts that have local or direct attached storage to the compute containers. This solution integrates Red Hat Gluster Storage deployment and management with OpenShift services. As a result, persistent storage is delivered within an OpenShift pod that provides both compute and file storage.
Converged Mode for OpenShift Container Platform is built around three key technologies:
  • OpenShift provides the platform as a service (PaaS) infrastructure based on Kubernetes container management. Basic OpenShift architecture is built around multiple master systems where each system contains a set of nodes.
  • Red Hat Gluster Storage provides the containerized distributed storage based on Red Hat Gluster Storage 3.4 container. Each Red Hat Gluster Storage volume is composed of a collection of bricks, where each brick is the combination of a node and an export directory.
  • Heketi provides the Red Hat Gluster Storage volume life-cycle management. It creates the Red Hat Gluster Storage volumes dynamically and supports multiple Red Hat Gluster Storage clusters.
The following list provides the administrators a solution workflow. The administrators can:
  • Create multiple persistent volumes (PV) and register these volumes with OpenShift.
  • Developers then submit a persistent volume claim (PVC).
  • A PV is identified and selected from a pool of available PVs and bound to the PVC.
  • The OpenShift pod then uses the PV for persistent storage.
Architecture - Converged Mode for OpenShift Container Platform
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Architecture - Converged Mode for OpenShift Container Platform

Figure 2.1. Architecture - Converged Mode for OpenShift Container Platform

Note

Red Hat Openshift Container Storage does not support a simultaneous deployment of converged and independent mode with ansible workflow. Therefore, you must deploy either converged mode or independent mode: you cannot mix both modes during deployment.
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