I have a homemade render farm that I cobbled together out of several retired PCs. My script splits the image into several slices, sends each slice to a node (6 slices for 6 nodes) and then combines the image in the compositor. My problem is that depth of field is inconsistent across nodes. Here's the result using the BMW test blend.
I've tested with other blends with DOF to the same result. If I render on a single node the noise isn't there, or at least it's even across the image so it's not noticed. Any idea how I can get a consistent results across nodes?