[Ocfs-users] Follow up on async I/O question

[Kevin Closson]

Sunil Mushran wrote:
>And as that gets into reading debugocfs outputs, the user has to make
the determination, if the effort is worth the gain in performance. Why
only logfiles? Well, because Oracle performs large ios only to the
logfiles. The ios to be datafiles are in smaller chunks. Hope this
helps. Sunil 


I'd like to point out a small mistake in this post.  Oracle most
certainly performs large IOs to more
than just logfiles.  Parallel Query and normal foreground processes
alike perform multiblock IO.
They are known as direct path read and write, scattered read and others
and are driven by full scans,
index range scans, foreground temp segment IO, recovery and so on.



Kevin Closson
Chief Architect, Database Solutions
PolyServe, Inc
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