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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.
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.
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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