[tahoe-dev] How much size if data fragments are sent to each server

Frederik Braun Frederik.Braun+tahoe at ruhr-uni-bochum.de
Tue Oct 9 08:10:43 UTC 2012


Hey Powell,

the amount of shares (needed, happy, total) can be set in your tahoe.cfg.

For this example, let's assume we use N=10, H=7, K=3.

Whenever a file is uploaded, it is encrypted and the cipher text is then
split into 10 shares so that 3 of them suffice for reconstruction, this
means that each share is a third (i.e. 1/K) of the real file. The total
space used on the grid is 10 * (size)/3 (i.e. N * (size)/K) then.
Tahoe tries to upload 10 shares to the grid and will return an error if
less than 7 can be placed.

I hope this answers your question. You might also take a look at the
docs at tahoe-lafs.org


This was just from the top of my head. Correct me if I'm wrong, rest of
the list :)


Cheers,
Frederik



On 10/09/2012 08:56 AM, Powell Tallen wrote:
> Dear All, Please how much of the fragment of data sent to tahoe grid
> are sent to each server. Is the data divided equally and the sent to
> each server or you can have different sizes sent to each server. I
> also understand that there are N=10 shares, H=7 servers which the 10
> are divided and sent to, and K=3 servers that are needed to
> reconstruct the data in case of any failure. Are these numbers just
> the defaults or one can change the numbers depending on what you
> want. Regards Powell
> 
> 
> 
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