In order to increase stability I use raw devices for all data and log devices, because the filesystem cache is not involved. As I understand, this does however reduce performance. Some OSs have async i/o built into their kernel which will improve performance on raw devices. On linux there is the KAIO patch available: http://oss.sgi.com/projects/kaio/
i don't know how an async-API should increase performance.
it just forces some kind of implicit parellelism, but as SAPDB does use many threads/processes, it shouldn't matter much.
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