Changes between Version 53 and Version 54 of Check

Timestamp:

Oct 29, 2010, 1:02:49 PM (14 years ago)

Author:

alexandru.olteanu

Comment:

--

Check

@@ -405 +405 @@
 [[Image(sh-multi island failing.png, center, 600px)]]
 
-Starting the Self-healing service changes this situation. Once a node fails, the service is able to start a node in either island. In the next screenshot, you may see how turning off the service on node 0001 in island2 makes the Self-healing service turn on node 0002 in island1:
+Starting the Self-healing service changes this situation. Once a node fails, the service is able to start a node in either island. In the next screenshot, you may see how turning off the service on node 0001 in island2 (browser window) makes the Self-healing service turn on node 0002 in island1 (lower terminal):
 
 [[Image(sh-multi island new node.png, center, 600px)]]
 
-Please note that not even a single sensor reading in the test client suffered of lack of sensors. In the next section, we detail a bit the timings.
+Please note that not even a single sensor reading in the test client suffered of lack of sensors (upper terminal). In the next section, we detail a bit the timings.
 
 === Performance ===
 
+The lag between the detection of a node failing and restoring the service, by turning it on for another node, is usually around a few miliseconds. We have tried a few measurements, for both local islands and remote islands. In these examples, the Self-healing service is running in the same network as the Bucharest island and we introduce node failures in both islands.
+
 [[Image(sh-performance.png, center, 600px)]]
 
+The data from the above screenshot is better shown in this table:
+
+||= Test no. =||= Node failure =||= Detection time =||= Service restored time =||= Lag =||
+|| 1 || remote || || ||
+|| 2 || remote || || ||
+|| 3 || remote || || ||
+|| 4 || remote || || ||
+
+You may notice that the mean restore time for local failures is ~ and the mean restore time for remote failures is ~. 
 
 = Proposed Check Demonstration Sketch =