"Jeff V. Merkey" wrote:
>
> At present, we call fsync() (which flushes dirty pages from cache) after
> a call to write() with an O_SYNC flag set (in essense creating a
> behavior like direct FS where data is not cached and the database can
> write-through the buffer cache. There is a belief that Oracle will
> really suck wind with the current implementation.
>
Oracle expects that block written will hit the disk before the call
returns. In a very busy system, Oracle could be writing most of the
time. In this case, O_SYNC performance will be critical. DirectFS was
good in that there was no double-buffering going on.
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