An interesting post by Brendan Gregg who did a very unthinkable experiment to his JBoss server.
So he found that when he shout at the JBoss server, the server will take a long Disk I/O latency....so he give us a "take away", do not shout at your Jboss if you want a high performance! :)
here is the link of Brendan Gregg's experiment:
http://blogs.sun.com/brendan/entry/unusual_disk_latency
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