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+ <H1>[Nel] Dynamic load balancing?</H1>
+ <B>Vincent Archer</B>
+ <A HREF="mailto:archer%40nevrax.com"
+ TITLE="[Nel] Dynamic load balancing?">archer@nevrax.com</A><BR>
+ <I>Wed, 21 Feb 2001 11:21:23 +0100</I>
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+<PRE>According to Thierry Mallard:
+&gt;<i> On Tue, Feb 20, 2001 at 11:21:38AM -0300, Nahuel Greco wrote:
+</I>&gt;<i> &gt; [... case of zone server failure ...]
+</I>&gt;<i> &gt; Then, you has the map divided in zones,... if a geographic server dies, other
+</I>&gt;<i> &gt; will be taking the zone that belong to the died server? ..
+</I>&gt;<i>
+</I>&gt;<i> The problem here will be persistency (is that english ? ;-). All the data
+</I>&gt;<i> currently in memory on server A, which is failing, will be lost for server B
+</I>&gt;<i> which is supposed to take over.
+</I>
+That's what you get with a purely geographic design, like EQ/UO design.
+When a zone fails, you get kicked out, everything you gained since your last
+save is lost, and when you return, every single critter has respawned. All
+state is lost, since all state was located in a single process.
+
+With a functional approach, all game entities are &quot;holographic&quot;
+regarding to storage. They're a kind of &quot;cloud&quot; of various agents located
+on various services. If a geographic server dies, you get suddendly
+a kind of fog for a while. Another service starts up, gets back information
+about what critters are where from the AI services, where all players are
+from the various player services, and what items are grown where from the
+ecology services. It takes a little time, but you recover more
+gracefully.
+
+The same occurs if an AI server dies. Those critters that were managed
+by that service freezes, but then another service takes them over. They
+will probably forget a lot of what they were doing, but they don't &quot;depop&quot;,
+since the geography service knows that there's that kind of beast
+that was located there.
+
+Of course there are services that are more critical than other. If a login
+service dies, all players using it are kicked out forcefully. If the
+item manager dies, your inventory locks up completely (but you still look
+like yourself, can move around, and talk).
+
+--
+Vincent Archer Email: <A HREF="mailto:archer@nevrax.com">archer@nevrax.com</A>
+
+Nevrax France. Off on the yellow brick road we go!
+
+</pre>
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