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docs/configuration.rst: clarify statement about lack of redundancy when shares.happy <= k. fixes #1793

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david-sarah 2012-07-12 20:30:26 +00:00
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docs/configuration.rst
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@ -346,8 +346,13 @@ Client Configuration
guarantee the availability of the uploaded file. This value should not be
larger than the number of servers on your grid.
A value of ``shares.happy`` <= ``k`` is allowed, but does not provide any
redundancy if some servers fail or lose shares.
A value of ``shares.happy`` <= ``k`` is allowed, but this is not
guaranteed to provide any redundancy if some servers fail or lose shares.
It may still provide redundancy in practice if ``N`` is greater than
the number of connected servers, because in that case there will typically
be more than one share on at least some storage nodes. However, since a
successful upload only guarantees that at least ``shares.happy`` shares
have been stored, the worst case is still that there is no redundancy.
(Mutable files use a different share placement algorithm that does not
currently consider this parameter.)