md devices mounted with async

[Wojciech Puchar]

>> but if you use FreeBSD 7 use tmpfs. it says it's experimental feature, but 
>> still not crashed on 3 computers i use it.
>
> There are known bugs, don't use it if you value your stability :)
>> what it's missing is some kind of quota, you may crash the system by simply 
>> filling it up and using all swap
>
> That's one of them.
>
but are there others? i don't fear of overflowing it, as no remote users 
log in here.