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The replication of your Cinder volumes really depends more on your backend storage device then OpenStack Cinder. If you are using Ceph as a storage backend for example though, your opportunity for replication could happen in a couple of ways. If your sites have low latency between them you could stretch your Ceph cluster between sites and then with the proper crush map could could conceivable have your volume pool (which would most likely contain your Cinder volumes) map its placement groups at both location to ensure multi-site coverage. If you had two Ceph clusters, one at each site, you could still do asynchronous replication through the RADOS gateway as another example.

Again depending on your RPO and the storage backend you are using will ultimately determine how you replicate.