On Thu, May 06, 2010 at 12:56:55AM -0700, John R Pierce wrote: > przemolicc at poczta.fm wrote: > > The above numbers are true if we have random (!) IO pattern. > > In case of sequential (!) IO even SATA disks can deliver much, much higher numbers. > > > > > sequential IO is remarkably rare in a typical server environment Yes, of course: Oracle's redo logs which are key performance factor for all transactions (inserts/updates) have sequential IO pattern. And Oracle is not a typical server environment .... > anyways, the IOPS numbers on sequential operations aren't much higher, > they are just transferring more data per operation. I didn't say that they _are_ much higher. I said that even SATA disks can deliver hight IOPS on condition of sequential IO. Regards Przemyslaw Bak (przemol) -- http://przemol.blogspot.com/ ---------------------------------------------------------------------- Audi kilka tysięcy złotych taniej? Przebieraj wśród tysięcy ogłoszeń! Sprawdz >>> http://linkint.pl/f26b3