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-rw-r--r--doc/design.txt31
1 files changed, 28 insertions, 3 deletions
diff --git a/doc/design.txt b/doc/design.txt
index d572543..29ca0a4 100644
--- a/doc/design.txt
+++ b/doc/design.txt
@@ -59,6 +59,31 @@ Scaling, performance, estimates
Open questions
- What's a good MMD? Google seems to sign a new tree after 60-90
minutes (early 2014). They don't promise an MMD but aim to sign at
- least once a day. We could start at 4h which would give us some time
- to sort things out in case of trouble. Should probably not promise
- anything like that for now though.
+ least once a day.
+
+A picture
+
++-----------------------------------------------+
+| front end nodes |
++-----------------------------------------------+
+ ^ ^ ^ ^
+ | | | |
+ | v | |
+ | short term long term |
+ | cert db cert db copy |
+ | ^ |
+ | | v
++-----------------------------------------------+
+| tree makers | mergers | signers |
++-----------------------------------------------+
+ ^ ^
+ \ |
+ \ v
+ ------------- long term
+ cert db
+
+[TODO: Update terms in text or picture so they match:
+secondary database == short term cert db
+primary database == long term cert db
+backend nodes == box with tree makers, mergers and signers]
+[TODO: Move the picture to the top of the document.]