Many SAN providers provide some sort of backup package that can be purchased to work with the SAN. Getting a backup product that integrates with your SAN's backend is super important for fast backups. For instance, if you have a NetApp setup, you can SnapMirror your datastore to a secondary NetApp datastore, and a product like VEEAM can connect through that second datastore to do its backups through your existing Hyper-V or VMWare setup. The result is that your production environment is not impacted at all once the full data has moved to the second backup repository. Doing full backups goes from making a huge impact in your environment, to none, because a separate set of disks is doing all the heavy lifting.
HP has a similar offering with 3PAR and StoreOnce, while EMC of course has their own ecosystem with the Storage system of your choice (VNX, VNXe, VMAX, etc) with Data Domain and Avamar.
Fact is nowadays, if you have a Storage Provider, chances are you have an entire vertical market channel they want you to work through to get the most out of your backups. If you have a SAN, be it HP 3PAR, NetApp, Dell Compellent, NetApp, or EMC, you should look at the products they offer to allow you to utilize non-impacting backups.
It will also be these large, 1st party solutions that will be showing the first signs of support in the enterprise for the large SMR drives this thread is about, as they are working closely to get integrated support (sometimes proprietary, sometimes not) for host-managed SMR.