Luke - the document you are looking at is 3 years old.  Ditch that bad boy & download a copy of H8224 (dated February 2014).  You'll find the answer on page 18 - the failback sync is a differential sync, aka 'diff_sync'.   Have fun, Rob
Hi all,  I'm assuming this question has already been answered somewhere. If so, please point me in the right direction [IMAGE].  With regard to SyncIQ, when failing back to the primary cluster, will this perform a full sync, rather than just changes that occurred whilst in DR? After reading the documentation and looking at a few websites, this seems to be what I am reading but I do not have a definitive answer (such as this doc [URL]  If that is the case, then that's a real issue when you are talking about 100TB+ of data. It is lucky we have a 40Gb link between Prod and DR datacentres but I imagine others do not have that luxury. Also, what happens to the data already on the Primary cluster?  Any help is appreciated.  Cheers, Luke.
SyncIQ and failing back