On Wed, 15 Jul 2009, Jorgen Lundman wrote:
You have some mighty pools there. Something I find quite interesting is
that those who have "mighty pools" generally obtain about the same data
rate regardless of their relative degree of excessive "might". This causes
me to believe that the Solaris kernel is throttling the read rate so that
throwing more and faster hardware at the problem does not help.
Are you saying the X4500s we have are set up incorrectly, or done in a way
which will make them run poorly?
No. I am suggesting that all Solaris 10 (and probably OpenSolaris
systems) currently have a software-imposed read bottleneck which
places a limit on how well systems will perform on this simple
sequential read benchmark. After a certain point (which is
unfortunately not very high), throwing more hardware at the problem
does not result in any speed improvement. This is demonstrated by
Scott Lawson's little two disk mirror almost producing the same
performance as our much more exotic setups.
Evidence suggests that SPARC systems are doing better than x86.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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