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In other words, you have two NFS backends, right? Declare them in the cinder.conf file. Each backend is managed by its own cinder-volume processes, which can run on the same node or two different nodes.

If you want the two NFS servers to look like a single backend, there will normally be a single cinder-volume process. See https://docs.openstack.org/ocata/config-reference/block-storage/drivers/nfs-volume-driver.html.

Two cinder-volume processes managing the same backend is also possible in an active-passive configuration, where one process is standing by in case the other becomes inaccessible or crashes. Work on active-active is ongoing, afaik. This blog documents the challenges and progress: https://gorka.eguileor.com.

In other words, you have two NFS backends, right? Declare them in the cinder.conf file. Each backend is managed by its own cinder-volume processes, process, which can run on the same node or two different nodes.

If you want the two NFS servers to look like a single backend, there will normally be a single cinder-volume process. See https://docs.openstack.org/ocata/config-reference/block-storage/drivers/nfs-volume-driver.html.

Two cinder-volume processes managing the same backend is also possible in an active-passive configuration, where one process is standing by in case the other becomes inaccessible or crashes. Work on active-active is ongoing, afaik. This blog documents the challenges and progress: https://gorka.eguileor.com.