md devices mounted with async

[Kris Kennaway]

Wojciech Puchar wrote:
>>
>> mdmfs(8) has an example of a malloc-backed md device mounted with the
>> async option. Is there any point in doing this with malloc and vnode
>> devices? In neither case does a write to the file-system require a write
>> to a physical disk.
> i don't think so.
> 
> 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.

Kris