On 02/10/2014 06:06 PM, Hugo Mills wrote:
>    Biggest multiplier leads to the pessimistic estimate, which is what
> I'd prefer to see here, so that's good. Agree with this.

I would prefer to use as "raid multiplier" the ratio 

 total data block groups + total metadata block group
--------------------------------------------------------------
    disk space allocated for data and metdata block group

I hope that this would work better when we have a filesystem composed 
by small (inlined) files or when we will have per-subvolume RAID levels.

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