Readind the fine manual, i saw a phrase saying that multiple OCRs (mirrowed OCRs) can cause an overhead. On my test env, i mirrowed my OCR to another diskgroup, even using normal redundancy in the original diskgroup. I did it only for learning/testing purpose. The main question is: This overhead is significant? I mean, if i add 5 redundant OCR copies, it will negativelly impact my env?