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2.2. Storage cluster deployment approaches

The growing list of operating modalities is an evidence that flexibility is a core tenet of Red Hat OpenShift Data Foundation. This section provides you with information that will help you to select the most appropriate approach for your environments.

You can deploy Red Hat OpenShift Data Foundation either entirely within OpenShift Container Platform (Internal approach) or to make available the services from a cluster running outside of OpenShift Container Platform (External approach).

2.2.1. Internal approach
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Deployment of Red Hat OpenShift Data Foundation entirely within Red Hat OpenShift Container Platform has all the benefits of operator based deployment and management. You can use the internal-attached device approach in the graphical user interface (GUI) to deploy Red Hat OpenShift Data Foundation in internal mode using the local storage operator and local storage devices.

Ease of deployment and management are the highlights of running OpenShift Data Foundation services internally on OpenShift Container Platform. There are two different deployment modalities available when Red Hat OpenShift Data Foundation is running entirely within Red Hat OpenShift Container Platform:

  • Simple
  • Optimized

Simple deployment

Red Hat OpenShift Data Foundation services run co-resident with applications. The operators in Red Hat OpenShift Container Platform manages these applications.

A simple deployment is best for situations where,

  • Storage requirements are not clear.
  • Red Hat OpenShift Data Foundation services runs co-resident with the applications.
  • Creating a node instance of a specific size is difficult, for example, on bare metal.

For Red Hat OpenShift Data Foundation to run co-resident with the applications, the nodes must have local storage devices, or portable storage devices attached to them dynamically, like EBS volumes on EC2, or vSphere Virtual Volumes on VMware, or SAN volumes.

注意

PowerVC dynamically provisions the SAN volumes.

Optimized deployment

Red Hat OpenShift Data Foundation services run on dedicated infrastructure nodes. Red Hat OpenShift Container Platform manages these infrastructure nodes.

An optimized approach is best for situations when,

  • Storage requirements are clear.
  • Red Hat OpenShift Data Foundation services run on dedicated infrastructure nodes.
  • Creating a node instance of a specific size is easy, for example, on cloud, virtualized environment, and so on.

2.2.2. External approach
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Red Hat OpenShift Data Foundation exposes the Red Hat Ceph Storage services running outside of the OpenShift Container Platform cluster as storage classes.

The external approach is best used when,

  • Storage requirements are significant (600+ storage devices).
  • Multiple OpenShift Container Platform clusters need to consume storage services from a common external cluster.
  • Another team, Site Reliability Engineering (SRE), storage, and so on, needs to manage the external cluster providing storage services. Possibly a pre-existing one.
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