It's a trap!
F8 is used to calculate write amplification. While it turns out this suggestion is irrelevant to your issue, possibly because the person posting didn't read through the whole thread, I don't see him/her asking for help only mentioning a bug/behavior. We don't just delete posts like this. Just tell him/her its unrelated and lets move on. Thanks.I see no suggestion in that post, nor any relevance to this thread's "excessively high Write Amplification" topic. Perhaps you misunderstood which bug s/he was referring to where s/he wrote about F8 increasing when "this" bug happened. I believe s/he meant the "pending sector" bug in the unraid forum thread, not the "high WAF" bug in our thread.