Dreadful gmirror performance - suggested changes to 'prefer'

[Andrew Snow]

> I havent looked at the code in detail, but I can't see that it would be too
> difficult. What do people think ?

If the first drive is always priority=0, then it is going to be stuck at 
the highest priority, or under your plan, the lower priority.

My original idea OTOH (starting the counting at 100) solves the problem 
with aone-line patch.  Call me biased but this is what I prefer :-)


- Andrew