On Tue, Oct 20, 2009 at 10:23 AM, Robert Dupuy <rdu...@umpublishing.org>wrote:
> A word of caution, be sure not to read a lot into the fact that the F20 is > included in the Exadata Machine. > > >From what I've heard the flash_cache feature of 11.2.0 Oracle that was > enabled in beta, is not working in the production release, for anyone except > the Exadata 2. > > The question is, why did they need to give this machine an unfair software > advantage? Is it because of the poor performance they found with the F20? > > Oracle bought Sun, they have reason to make such moves. > > I have been talking to a Sun rep for weeks now, trying to get the latency > specs on this F20 card, with no luck in getting that revealed so far. > > However, you can look at Sun's other products like the F5100, which are > very unimpressive and high latency. > > I would not assume this Sun tech is in the same league as a Fusion-io > ioDrive, or a Ramsan-10. They would not confirm whether its a native PCIe > solution, or if the reason it comes on a SAS card, is because it requires > SAS. > > So, test, test, test, and don't assume this card is competitive because it > came out this year, I am not sure its even competitive with last years > ioDrive. > > I told my sun reseller that I merely needed it to be faster than the Intel > X25-E in terms of latency, and they weren't able to demonstrate that, at > least so far...lots of feet dragging, and I can only assume they want to > sell as much as they can, before the cards metrics become widely known. > -- > That's an awful lot of assumptions with no factual basis for any of your claims. As for your bagging on the F5100... what exactly is your problem with its latency? Assuming you aren't using absurdly large block sizes, it would appear to fly. 0.15ms is bad? http://blogs.sun.com/BestPerf/entry/1_6_million_4k_iops --Tim
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