Comments on: SSD http://jonathanlewis.wordpress.com/2012/10/05/ssd-2/ Just another Oracle weblog Sat, 18 May 2013 11:04:10 +0000 hourly 1 http://wordpress.com/ By: Jared http://jonathanlewis.wordpress.com/2012/10/05/ssd-2/#comment-50647 Fri, 05 Oct 2012 13:47:56 +0000 http://jonathanlewis.wordpress.com/?p=9607#comment-50647 I’m not too surprised about Guy’s conclusions about redo on SSD.
This is not because I am expert on SSD (I can spell it) but because I attended a presentation a couple of years ago by a couple of engineers from LSI.
Their job was to do performance testing of the new LSI SSD product for Oracle Flashcache.
They were surprised to consistently find that redo performed better on spinning rust than on SSD.
After discussing it with some other engineers they had a better understanding of the limitations of SSD when used with redo.
The Powerpoint for that presentation is here:
http://www.oswoug.org/Slides/LSI/SolidStateStorageinOracleEnvironmentsv4.pptx

The most interesting redo bits aren’t available in the presention, you had to be there.
There is mention however that due to sequential writes redo performs better on HDD.

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