On Mon, Jan 24, 2011 at 10:15:14PM -0500, Martin K. Petersen wrote: > >>>>> "Herbert" == Herbert Poetzl <herbert@xxxxxxxxxxxx> writes: > Herbert> - the drive doesn't report 4k sectors at all, not > Herbert> even as physical sector size. > There have been numerous threads on this list about EARS not > reporting block sizes correctly. Check the archives. really? well, they probably use strange subjects or the search function on the archives is broken ... I did a search on the archives, and I get a totla of 30 threads containing EARS (in linux-ide) and most of them talk about something completely different (like rabbit ears :) > Herbert> My question now is, how can I tell the kernel that this drive > Herbert> actually has 4k physical sectors and that it would be a smart > Herbert> thing to send requests in some kind of 4k I/O chunks? > Align your partitions on a 4K boundary. While this will ensure that the drive performance is better than without doing so (I'm not using a partition table on that drive anyways, but I get what you mean), this doesn't inform the kernel about proper I/O sizes and for sure doesn't prevent unnecessary read-change-write operations for the disc ... best, Herbert > -- > Martin K. Petersen Oracle Linux Engineering > -- > To unsubscribe from this list: send the line "unsubscribe linux-ide" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
