Hello, Patrick, and thanks for the reply. >You could try setting read cache disable, I don't know if that setting >must be honored, or how ATA/SATA handle it. See mode page 8 for SCSI block >commands. Hmm, that's definitely worth a shot. I'll try it and let you know how it works. >The sg utilities sg_modes can probably set it. As would the new sdparm, I imagine. >Better yet, do IO to more locations on the disk, not just the very >beginning and the very end. In our seek tests, we do (in order) full-stroke, one-third capacity, and random seeks. The random seeks appear to be reasonably well-behaved, although still lower than what we're used to seeing (read time is roughly 75% of the seek time on an average of four runs of 100 seeks each). >-- Patrick Mansfield Drew - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
