If you install OCI Data Source Service Pack 7, or upgrade to OCI 7.3.9 (which has SP7 built in), you will be able to successfully inventory Nimble 3.7.0+ firmware arrays, along with the Nimble 4.0+ firmware arrays we have been supporting for a few quarters now.
Nimble 3.x has some REST API differences from 4.0+, so we have had to work around some gaps, and implement some alternative approaches. With SP7, we are *not* reporting fibre channel mapping and masking for volumes on arrays running firmware X where (3.7.0 <= X < 4.0.0) , so you will not see OCI build paths to volumes. We have subsequently solved this, and can give you a post-SP7 datasource patch that reports FC mapping and masking for those impacted arrays.