On Oct 3, 2007, at 5:21 PM, Richard Elling wrote:
> Slightly off-topic, in looking at some field data this morning
> for something completely unrelated) I notice that the use of directio
> on UFS is declining over time. I'm not sure what that means...
> not more performance escalations...
Sounds like someone from ZFS team needs to get with someone from
Oracle/MySQL/Postgres and get the skinny on how the IO rubber->road
boundary should look, because it doesn't sound like there's a
definitive or at least a sure answer here.
Oracle trumpets the use of DIO, and there are benchmarks and first-
hand accounts out there from DBAs on its virtues - at least when
running on UFS (and EXT2/3 on Linux, etc)
As it relates to ZFS mechanics specifically, there doesn't appear to
be any settled opinion.
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