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Hi Wodel,

You simply need to create a cinder-volume.conf in your config override directory with the backend blocks you want, eg:

$ cat cinder-volume.conf
[DEFAULT]
enabled_backends=nimble-az1,nimble-az2,ceph-nvme-az3
cross_az_attach = False

[nimble-az1]
san_ip = {{ nimble_az1_controller_vip }}
san_login = {{ nimble_admin_user }}
san_password = {{ nimble_admin_password }}
volume_driver = cinder.volume.drivers.nimble.NimbleISCSIDriver
volume_backend_name = nimble
backend_availability_zone = {{ availability_zone_1 }}
backend_host = {{ nimble_hostgroup }}
report_discard_supported = True
enable_unsupported_driver = True
suppress_requests_ssl_warnings = True
use_multipath_for_image_xfer = False

[nimble-az2]
san_ip = {{ nimble_az1_controller_vip }}
san_login = {{ nimble_admin_user }}
san_password = {{ nimble_admin_password }}
volume_driver = cinder.volume.drivers.nimble.NimbleISCSIDriver
volume_backend_name = nimble
backend_availability_zone = {{ availability_zone_2 }}
backend_host = {{ nimble_hostgroup }}
report_discard_supported = True
enable_unsupported_driver = True
suppress_requests_ssl_warnings = True
use_multipath_for_image_xfer = False

[ceph-nvme-az3]
volume_driver = cinder.volume.drivers.rbd.RBDDriver
rbd_pool = {{ ceph_cinder_pool_name }}
rbd_ceph_conf = /etc/ceph/ceph.conf
rbd_flatten_volume_from_snapshot = false
rbd_max_clone_depth = 5
rbd_store_chunk_size = 4
rados_connect_timeout = 5
rbd_user = {{ ceph_cinder_user }}
rbd_secret_uuid = {{ cinder_rbd_secret_uuid }}
report_discard_supported = True
image_upload_use_cinder_backend = True
volume_backend_name = high-performance
backend_availability_zone = {{ availability_zone_3 }}
backend_host = ceph-nvme


Please note that the ceph setup in kolla-ansible is fairly rigid and assumes a single cinder pool and a single cinder ceph user.  You are probably better off defining your own ceph blocks if you need to split across the separate pools.

If you better want to understand the workflow for kolla deploying ceph here are the relevant sections:
https://github.com/openstack/kolla-ansible/blob/8371d979b6c07ec64eb56b5948c999672a67c6d5/ansible/roles/cinder/templates/cinder.conf.j2#L134
https://github.com/openstack/kolla-ansible/blob/stable/yoga/ansible/roles/cinder/tasks/external_ceph.yml

Cheers,
Danny

________________________________
From: wodel youchi <wodel.youchi at gmail.com>
Sent: 05 May 2022 09:19
To: OpenStack Discuss <openstack-discuss at lists.openstack.org>
Subject: [Kolla-ansible][xena] how to deploy multiple cinder backends?


CAUTION: This email originates from outside THG

________________________________
Hi,

I want to deploy multiple cinder backends, ceph SSD pool for high performance VMS, ceph SAS pool for normal VMS and NFS share for small VMS and for cinder backup.

Could that be done while deploying or it has to be done after the initial deployment?

Could you assist me with some examples, sometimes the documentation is not that obvious to understand.

Regards.

Danny Webb
Principal OpenStack Engineer
The Hut Group<http://www.thehutgroup.com/>

Tel:
Email: Danny.Webb at thehutgroup.com<mailto:Danny.Webb at thehutgroup.com>

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