gmirror + subset of partitions gjournal'd, autosync setting?

[Carl]

Carl wrote:
> I've built a GEOM mirror on a single slice of a single disk and am about 
> to insert the second disk. Of the partitions in the mirror, I made only 
> a few of them gjournal'd. I've seen it recommended that one disable 
> autosynchronization for the mirror if using journaled filesystems.
> 
> 1. Is that recommendation a must or a nice-to-have? What are the actual 
> consequences of not taking that advice?
> 
> 2. In a case like mine, the non-journaled partitions need 
> autosychronization enabled to benefit from being mirrored, right?
> 
> 3. Exactly how would I disable autosynchronization for the journaled 
> partitions in the mirror, but not for the rest?

Can no one help me with this question?

Carl                                             / K0802647