This was posted in a filesystem irc chat:
http://blogs.sun.com/brendan/entry/unusual_disk_latency
Pretty interesting stuff, it also makes you wonder how much resonance is
acceptable for an array and besides using dtrace/etc how could one measure
it? I know with 3ware you can turn on dpmstat etc for the higher end 9xxx
controllers to check iops per disk etc, but not all hosts may have 3ware
controllers, so besides making sure you utilize anti-vibration
devices/techniques (rubber washers etc) how could one measure this?
Justin.
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