We have a potential project that is looking like it will require a 12TB system. It's well known to use a QAS system as the HA or DR target to save on having to purchase additional nodes. I understand the architecture will depend on the customers BC/DR requirements. I have numbers on the additional resources the replication process would necessitate be available on the target system. I also realize, I should talk with the vendor, etc......
Of course, we would rather not have a 12TB dedicated node sitting in a secondary DC that will (hopefully) never be used.
Please share any real world experience implementing a dual purpose DR appliance at a 12TB scale and specifically if there are any considerations that may need to be looked at that smaller scale-ups may not require.