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It was the kernel. We were using 2.6.32, which is quite old, but it is the one supported by Red Hat EL and Scientific Linux. Today I had lunch with a friend (Giuseppe Ottaviano) who had a similar experience tuning high-performance indexing algorithms. After upgrading to the newest version everything (compiler, libraries, etc.) he changed the kernel to the ...


Regarding the txt file, it all seems "normal" for all computers... low await (disk latency), rather lower (=better) for the "bad" computers... request queue not too bad, 0 wa (IO wait time in vmstat). But you went from 5MB/30sec to 130 MB/sec, what's up?

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