Cinder is the OpenStack block storage (volume) service and allow for different backends to be used to provision volumes. The cinder 3PAR charm provides integration between Cinder service and HPE 3PAR storage array solution. Users can request volumes using OpenStack APIs and get them provisioned on 3PAR and distributed with either Fiber Channel or iSCSI connection.

This section covers common and/or important configuration options. See file config.yaml for the full list of options, along with their descriptions and default values. See the [Juju documentation][juju-docs-config-apps] for details on configuring applications.

HPE 3PAR Fiber Channel demands cinder-volume service to be run on baremetal with direct access to the fiber channel interfaces.

In this type of deployment, break cinder into two applications:

    cinder-api:
      charm: cs:cinder
      options:
        enabled-services: "api,scheduler"
        ...
    cinder-volume:
      charm: cs:cinder
      options:
        enabled-services: "volume"

Cinder-api can be mapped to lxc containers while cinder-volume needs to be placed on a host with access to the fiber channel backend.

Cinder can be backed by HPE 3PAR SAN Array, which provides commercial hardware backend for the volumes.

File cinder.yaml contains the following:

    cinder-three-par:
      driver-type: fc
      san-ip: 1.2.3.4
      san-login: CHANGE_TO_LOGIN
      san-password: CHANGE_TO_PWD
      hpe3par-username: CHANGE_TO_USERNAME
      hpe3par-password: CHANGE_TO_PWD
      hpe3par-api-url: https://<API_IP>/
      hpe3par-cpg: <SELECT A CPG>
      hpe3par_cpg_snap: <SELECT A CPG>

Here, Cinder HPE 3PAR backend is deployed to a container on machine '1' and related the cinder subordinate charm:

juju deploy --to lxd:1 --config cinder-three-par.yaml cinder
juju deploy cinder-three-par
juju add-relation cinder-three-par:storage-backend cinder:storage-backend

Optionally, set option:

      hpe3par-debug: True

To gather more logs on the deployment.

Create and activate a virtualenv with the development requirements:

virtualenv -p python3 venv
source venv/bin/activate
pip install -r requirements-dev.txt

The Python operator framework includes a very nice harness for testing operator behaviour without full deployment. You can run tests with tox.