We just upgraded to Splunk 6.4.1 this weekend (yay team!). I'm looking into the awesomeness of the DMC, and two reports have me perplexed - the "Maximum IO Bandwidth" and the "Median Disk Usage". I have a fair amount of "red" in those reports. I clicked on the "learn more" link, but all it does it take me to the main Splunk doc page. Can someone explain these reports? I've attached an example.
Quick lazy thought: did you post this question (or a link to this answers post) on the corresponding dashboard's doc page? At the bottom (footer) of the docs page should be a place to ask this to get them to clarify in the docs the answer to your question.