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To complete the answers :

LVM use ISCSI portals on storage Node usually with DAS Storage . Then Cinder expose it over bloc mode on instance.

If you have already a storage Array, better to use the constructor Driver (Netapp, Dell-EMC, Hitachi) for a direct FC access to your Lun => best performance and fiability . LVM was for testing and should not be use in a production environnement .

Best storage with OpenStack is CEPH (my opinion ;)