We're planning to move some production workloads to a UCS environment using vSAN and all flash. We are looking at vSAN with replication as we have two identical nodes in two data centres.
Is there a performance hit from using replication that would negate the benefits of the all flash storage?
We are currently using LeftHand and the write latency introduced by a commit having o be confirmed from all nodes before the write commit is passed up to the storage consumer makes it very slow. I've tried to find documentation on this but came up short.