> The math used by disperse, if tested alone outside gluster, is much > faster than it seems. AFAIK the real problem of EC is the communications > layer. It adds a lot of latency and having to communicate simultaneously > and coordinate 6 or more bricks has a big impact. Thanks for posting this, Xavier. "Erasure codes are slow because of the math" is a common misunderstanding, unfortunately sustained by much of the marketing around various EC implementations. As far as I can tell, EC is mostly fast or slow according to how well the implementation solves coordination problems, except for repair (in which case the choice of algorithm can affect how much data needs to be moved). _______________________________________________ Gluster-devel mailing list Gluster-devel@xxxxxxxxxxx http://www.gluster.org/mailman/listinfo/gluster-devel
