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A comment on Unusual disk latency. Parent comment
In a storage appliance, you wouldn't expect the load to be overwhelmingly CPU bound[1], so performing real time instrumentation isn't a noticeable performance hit: http://www.solarisinternals.com/wiki/index.php/DTrace_Topics...
[1]: assuming you aren't using ZFS gzip compression: http://blogs.smugmug.com/don/2008/10/13/zfs-mysqlinnodb-comp...
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In a storage appliance, you wouldn't expect the load to be overwhelmingly CPU bound[1], so performing real time instrumentation isn't a noticeable performance hit: http://www.solarisinternals.com/wiki/index.php/DTrace_Topics...
[1]: assuming you aren't using ZFS gzip compression: http://blogs.smugmug.com/don/2008/10/13/zfs-mysqlinnodb-comp...