In this scenario, I wanted to have two cinder backends both on NFS. My first NFS share is backed by HDD, my second one by SSD. This could be renamed “fast” and “slow” or any other names.
First, add your two backends in /etc/cinder/cinder.conf
Then, at the end of your cinder.conf file, add the configuration details for each backend. Each backend is defined after the backend name in brackets [backend_name]. Obviously, you could use another driver than NFS if you have another type of storage.
[hdd] nfs_used_ratio=0.95 nfs_oversub_ratio=1.0 volume_driver=cinder.volume.drivers.nfs.NfsDriver nfs_shares_config=/etc/cinder/nfs_shares_hdd.conf volume_backend_name=hdd [ssd] nfs_used_ratio=0.95 nfs_oversub_ratio=1.0 volume_driver=cinder.volume.drivers.nfs.NfsDriver nfs_shares_config=/etc/cinder/nfs_shares_ssd.conf volume_backend_name=ssd
Restart your cinder services:
openstack-service restart cinder
Create your NFS share location file for each offering:
# vi /etc/cinder/nfs_shares_ssd.conf 192.168.12.1:/storage/ssd/cinder # vi /etc/cinder/nfs_shares_hdd.conf 192.168.12.1:/storage/hdd/cinder
Finally, create your new cinder types and set the backend name for each type as defined in your cinder.conf file:
cinder type-create hdd cinder type-key hdd set volume_backend_name=hdd cinder type-create ssd cinder type-key ssd set volume_backend_name=ssd
You should now be able to create cinder volumes for both types of offering. You can review your configuration by listing the specs:
Logs are in /var/log/cinder/*.log if you need to troubleshoot any issue.