On Thursday 21 October 2010 21:42:06 Kevin Grittner wrote:
> Bruce Momjian <br...@momjian.us> wrote:
> > I assume we send a full 8k to the controller, and a failure during
> > that write is not registered as a write.
> 
> On what do you base that assumption?  I assume that we send a full
> 8K to the OS cache, and the file system writes disk sectors
> according to its own algorithm.  With either platters or BBU cache,
> the data is persisted on fsync; why do you see a risk with one but
> not the other?
At least on linux pages can certainly get written out in < 8kb batches if 
youre under memory pressure.

Andres



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