I have not heard nor seen any way. Generally, the engineers handle that sort of stuff a lot better than the end user, so I'm curious as to why you would want to play with those settings. And disabling direct IO - why? That is the element
that makes CSV so powerful. Disabling it is a sure was to make everything start crawling. You can cause a volume to go into redirected mode, but to disable direct IO is another thing I have not seen or heard of.
.:|:.:|:. tim