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s/node/client; mention restart is needed

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Zooko O'Whielacronx 2013-04-09 00:48:23 -06:00 committed by Brian Warner
parent 07f7d50afa
commit 643eb4f372
1 changed files with 17 additions and 14 deletions
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31
docs/convergence-secret.rst
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@ -5,16 +5,16 @@ What Is It?
The identifer of a file (also called the "capability" to a file) is derived
from two pieces of information when the file is uploaded: the content of the
file and the upload node's "convergence secret". By default, the convergence
secret is randomly generated by the node when it first starts up, then stored
in the node's base directory (<Tahoe's node dir>/private/convergence) and
re-used after that. So the same file content uploaded from the same node will
always have the same cap. Uploading the file from a different node with a
different convergence secret would result in a different cap—and in a second
copy of the file's contents stored on the grid. If you want files you upload
to converge (also known as "deduplicate") with files uploaded by someone
else, just make sure you're using the same convergence secret when you upload
files as they
file and the upload client's "convergence secret". By default, the
convergence secret is randomly generated by the client when it first starts
up, then stored in the client's base directory (<Tahoe's node
dir>/private/convergence) and re-used after that. So the same file content
uploaded from the same client will always have the same cap. Uploading the
file from a different client with a different convergence secret would result
in a different cap—and in a second copy of the file's contents stored on the
grid. If you want files you upload to converge (also known as "deduplicate")
with files uploaded by someone else, just make sure you're using the same
convergence secret when you upload files as they
The advantages of deduplication should be clear, but keep in mind that the
convergence secret was created to protect confidentiality. There are two
@ -54,8 +54,8 @@ All your old file capabilities will still work, but the new data that you
upload will not be deduplicated with the old data. If you upload all of the
same things to the grid, you will end up using twice the space until garbage
collection kicks in (if it's enabled). Changing the convergence secret that a
node uses for uploads can be though of as moving the node to a new
"deduplication domain".
storage client uses for uploads can be though of as moving the client to a
new "deduplication domain".
How To Use It
-------------
@ -69,7 +69,10 @@ scp installed, run:
*scp ~/.tahoe/private/convergence
my_other_account@B:.tahoe/private/convergence*
If you have two different nodes on a single computer, say one for each disk,
you would do:
If you have two different clients on a single computer, say one for each
disk, you would do:
*cp /tahoe1/private/convergence /tahoe2/private/convergence*
After you change the convergence secret file, you must restart the client
before it will stop using the old one and read the new one from the file.