Description of problem:


Description of the use case:
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In CNS "Container-Native Storage for OpenShift Container Platform" document, chapter #11->Point #10, there's a brief mention of setting up Container-Native Storage volumes for geo-replication to a non-Container-Native Storage remote site. 

The document doesn't mention that heketi could be used to create volumes on the slave side. As Heketi provides ease of administration and allows us to scale volume more easily, it may help to use standalone heketi in non-CNS side.

E.g.
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If we create master volume using CNS(PVC) it gets a particular size and creating similar sized volume on slave without heketi could be a challenge. This is because there is a --size= option in heketi to create volume of a particular size.

Also, it would be of great help to document the detailed steps for CNS+geo-rep setup. 

Document Link
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https://access.redhat.com/documentation/en-us/container-native_storage/3.9/html-single/container-native_storage_for_openshift_container_platform/

Document Section
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Chapter 11. Operations on a Red Hat Gluster Storage Pod in an OpenShift Environment --> Point #10.

Current details in doc
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There's no mention of heketi for slave side gluster setup.

Snippet from current document
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You can set up Container-Native Storage volumes for geo-replication to a non-Container-Native Storage remote site. Geo-replication uses a master–slave model. Here, the Container-Native Storage volume acts as the master volume. To set up geo-replication, you must run the geo-replication commands on gluster pods. To enter the gluster pod shell, execute the following command:

 # oc rsh <gluster_pod_name>

For more information about setting up geo-replication, refer https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.2/html/administration_guide/chap-managing_geo-replication.



















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