RHSS use case for OpenShift/RHEV for Private/public cloud

Good Morning,

I am researching the feasibility of leveraging Red hat storage server 3 to support block and file storage services, to be consumed by PaaS (OpenShift Enterprise) and IaaS (leveraging RHEV hypervisors).

There are three basic tiers of services we wish to leverage RHSS for, such as:

1) VM Image Filesystem (NFS Based), support RHEV and CloudForms (IaaS use case)
2) File and Block Storage user services, to be leveraged by OpenShift users and services (PaaS use case)
3) Blob storage services, to be leveraged for general storage supporting Geospatial/Analytics (PaaS but more Big Data use case).

I have read that RHSS is not recommended for high IOPS/transaction-based workloads, so the question I have is if there is any benchmark on IOPS profile suited for RHSS?

Also, how well does RHSS 3 perform in a hybrid cloud use case (where IaaS/PaaS services consume storage services from both Private - read: high performance and Public - read: varied performance)?

Any reference architecture available for hybrid cloud implementations of RHSS are greatly appreciated.

And lastly, any cost model and ROI analysis available for public consumption, when attempting to compare RHSS versus proprietary storage systems (such as, NetApp and EMC).

Thanks.