> vacuum should be a process with the least amount of voodoo. 
> If we can just have vacuum_delay and vacuum_threshold, where 
> threshold allows an arbitrary setting of how much bandwidth 
> we will allot to the process, then that is a beyond wonderful thing.
> It is easy to determine how much IO you have, and what you can spare.

The tricky part is what metric to use. Imho "IO per second" would be
In a typical DB scenario that is the IO bottleneck, not the Mb/s.


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