On Fri, Sep 11 at 13:14, Tim Cook wrote:
Better IOPS? Do you have some numbers to back that claim up? I've never heard of anyone getting "much better" IOPS out of a drive by simply changing the interface from SATA to SAS. Or SATA to FATA for that matter. A 7200RPM drive is limited by the 7200RPM's, not the interface it's attached to.
Depends on the model of drive. A number of vendors put relatively larger magnets and stronger actuators in their enterprise designs, where the customers are willing to pay for it. This can significantly decrease track-to-track seek times, which improves IOPS. On top of that, many enterprise drives are using smaller platters and/or higher RPM, both of which also help IOPS at shallow queue depths. At infinitely high queue depth, IOPS basically becomes a function of how quickly the servo system can settle, since seek distances approach zero (both linearly and rotationally) as the number of operations to choose from goes to infinity. -- Eric D. Mudama edmud...@mail.bounceswoosh.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
