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+[[forum/tips:_special__95__remotes__47__hook_with_tahoe-lafs]] is a good
+start, but Zooko points out that using Tahoe's directory translation layer
+incurs O(N^2) overhead as the number of objects grows. Also, making
+hash subdirectories in Tahoe is expensive. Instead it would be good to use
+it as a key/value store directly. The catch is that doing so involves
+sending the content to Tahoe, and getting back a key identifier.
+
+This would be fairly easy to do as a [[backend]], which can assign its
+own key names (although typically done before data is stored in it),
+but a tahoe-lafs special remote would be more flexible.
+
+To support a special remote, a mapping is needed from git-annex keys to
+Tahoe keys.
+
+The best place to store this mapping is perhaps as a new field in the
+location log:
+
+	date present repo-uuid newfields
+
+This way, each remote can store its own key-specfic data in the same place
+as other key-specific data, with minimal overhead.
+
+Unfortunatly, the current location log parser throws out lines that it 
+cannot parse, so making this change would involve something of a flag day
+upgrade. Also unfortunatly, the location log and other .git-annex/ data
+does not have its own version that can be checked to force an upgrade
+across all clones. It might be best to deal with this at the same time
+the ideas in [[branching]] are done. --[[Joey]]