>>>>> "Greg" == Greg Freemyer <greg.freemyer@xxxxxxxxx> writes: Greg> In theory 4K physical sector drives with XP alignment will Greg> eventually ship and possibly have already. Well, that's a definite maybe :) The 4K transition took much longer than anticipated and Vista and beyond know how to query the drives for alignment. So I'm guessing that we'll only see 1-alignment via a jumper at this point. Greg> I don't know it any those drives exist yet, or if they ever will. I have a bunch, but obviously they are mostly prototypes. Greg> mdadm should as well, not just blindly say 1MB is the magic Greg> alignment point. (ie. linux can do better than Win2008/Win2003 Greg> which simply disagree with each other on how to align.) We're going with 1MB as default because that's the new storage industry consensus. It's a less formalized number than - say - IDEMA sector counts, but it appears to have reached critical mass among the vendors. And obviously we'll compensate if the storage device reports a different alignment via the relevant ATA or SCSI knobs. -- Martin K. Petersen Oracle Linux Engineering -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
