Chris, I'm afraid sequential pre-fetch kinda of makes your point invalid for sequential IO.
> > A real 3390 (do they still exist?) even reading just a R0 from a track will take as > long as reading two 27K blocks of data from a track. A similar problem exists > with a 32K blocksize on a 3390. The reason for this is you just have to wait for > the disk to spin. Years ago we used to calculate how many times the disk had > to spin, then determine how long that should take and see how close our > elapsed actually was to that calculated ideal time. > Ron ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
