Does ABM & CBT Improve Hybrid Replication Speed
With the advent of CBT and ABM, hybrid replication need not be used, as they are doing essentially the same thing, so no advantage is gained by using them in concert. The idea behind hybrid is to capture changes in a snapshot so no disk scan is needed, thus saving time in replication. With CBT, and further with ABM, these technologies also capture changes between passes, saving the time of a disk scan. To be clear, ABM filters deleted data from the CBT filter, which would otherwise have been blocks contained in a delta (snapshot) file that would have been transferred anyway. So, a differential job with CBT and ABM should provide the same benefit as a hybrid job, without requiring a snapshot to remain open on the source VM.
