[tahoe-dev] Doubts about time taken to upload a file

Shawn Willden shawn at willden.org
Mon Jan 3 14:04:33 UTC 2011

On Mon, Jan 3, 2011 at 4:47 AM, sreenivasulu velpula <v.sreenu at gmail.com>wrote:
> Can any one tell why is there a big difference compared to the initial
> upload time and  remaining upload times?

You didn't say whether you uploaded the file as mutable.  If not, then the
reason is very simple:  Tahoe didn't actually have to upload the file the
other 11 times.  It noticed the file was already stored in the grid and so
didn't upload it again.

If you used the "tahoe backup" command to upload it, then it was uploaded as
an immutable file.

No matter how many times you upload an immutable file through a given Tahoe
node, there is only one copy of it stored in the grid -- though of course
that copy is stored on n servers such that any k of them is sufficient to
recover it.  If you upload through a different Tahoe node, by default it
will have a difference "convergence secret", which will cause the encrypted
version of the file to be different so it will have to be uploaded and
stored again.

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