Yes, I've been using it without Jumbo Frames for almost a year. I get about 75MB/s up and down. It's pretty good, but I need to improve it. Also, there are some latency issues. I sometimes get "dropped frames" when capturing video to it. Everyone I've spoken to says the Jumbo Frames is a must for this type of application. My switch and all components are set to use Jumbo Frames.

The disks are nowhere even close to being a bottleneck. It's a 3ware controller, 256kb block size with write cache enabled. And as I said, the write speed only goes down a lot when Jumbo Frames are enabled.

The default settings on Atto XtendSAN v2.0 have all burst lenghts's very high compared to the Open-E's default settings (1048576). The Open-E settings seem to override them anyways.

Thanks for posting that link, but it's really just a description of what the code lines are to configure it. It doesn't explain what things like InitialR2T and ImmediateData mean.