Added more content about scalability.

report.lyx

@@ -649,7 +649,7 @@ For reliable transfers, TCP is often used on the Internet.
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 \begin_layout Section
-Encryption
+Fault Tolerant
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 \begin_layout Subsubsection
@@ -689,6 +689,47 @@ Scalability
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 \begin_layout Standard
+Each instance of GGS contains several tables.
+ Each table is an isolated instance of a game, for example a chess game
+ or a poker game.
+ The way that GGS scales is to distribute these tables on different servers.
+ In many games it is not necessary for a player to move between tables during
+ games.
+ This is for example not a common occurrence in chess, where it would be
+ represented as a player standing up from her current table and sitting
+ down at a new table, all within the same game session.
+ With this in mind, the main focus of GGS is not to move players between
+ tables, but to keep a player in a table, and to start new tables instead.
+ When a server has reached a certain amount of players the performance will
+ start to decrease.
+ To avoid this GGS will start new tables on another server, using this technique
+ the players will be close to evenly distributed between the servers.
+ It is important to investigate and find out how many players that are optimal
+ for each server.
+ This approach makes it possible to utilize all resources with moderate
+ load, instead of having some resources with heavy load and some with almost
+ no load.
+\end_layout
+
+\begin_layout Standard
+As mentioned in the purpose section there are two different types of scalability
+, structural scalability and load scalability.
+ To make GGS scalable both types of scalability are needed.
+ Structural scalability means in our case that it should be possible to
+ add more servers to an existing cluster of servers.
+ By adding more servers the limits of how many users a system can have is
+ increased.
+ Load scalability in contrast to structural scalability is not about how
+ to increase the actual limits of the system.
+ Instead it means how good the system handles increased load.
+ GGS should be able to scale well in both categories.
+\end_layout
+
+\begin_layout Standard
+\begin_inset Note Note
+status open
+
+\begin_layout Plain Layout
 Because P2P game architectures are a constant goal for cheaters and because
  “Cheating is a major concern in network games as it degrades the experience
  of the majority of players who are honest” and preventing cheating in P2P
@@ -697,6 +738,11 @@ Because P2P game architectures are a constant goal for cheaters and because
  In this paper we want to show some strategies to achieve scalability.
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+\end_inset
+
+
+\end_layout
+
 \begin_layout Subsubsection
 UUID 
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@@ -719,6 +765,10 @@ We only support languages running in a sandboxed environment.
  of this not modify the persistent data of other games.
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+\begin_layout Subsection
+Encryption
+\end_layout
+
 \begin_layout Chapter
 Overview 
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