Comment 4 for bug 1378063

I haven't found many fresh benchmarks regarding the issue. The most relevant link I've seen is [1], which shows better performance of O_DIRECT in SAN, there is also detailed comment written by engineer from Oracle about many factors affecting the results. IMHO it may be better to just expose innodb_flush_method in puppet to let deployment engineers decide and explicitly set it to the default MySQL value – fdatasync.

[1] http://themattreid.com/wordpress/2012/01/06/san-vs-local-disk-innodb_flush_method-performance-benchmarks/