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For every access by TULIP the response for each landmark is logged. We analyze this logging information and generate a list containing nodes with corresponding success or failure percentages and reasons of their failures. These percentages are generated by /afs/slac/package/netmonpinger/tulip/tulip-log-analyze.pl and the results can be seen here. The idea is that landmarks with a low success rate should be removed from the active list of landmarks. This is done by disabling the entry in the tulip database.
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After solving the cleaning up process, we need to address another situation and that is whether any of those hosts would come back and if yes how we would know. Should we disable them forever or should we build up some mechanism to bring them back ? To solve this problem we devised a notification process, which can help us in identifying the landmarks which are up. The above mentioned script is in /afs/slac.stanford.edu/package/pinger/tulip
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This script performs following actions to identify landmarks being up or down. |
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