On Mon, 21 Jul 2014 13:45:22 -0700 Linda Walsh <[email protected]> wrote:
> Dave Chinner wrote: > > > >> I can partition the disk and setup the allocation size > >> to 4096, but I'd like to tell the kernel to use a > >> virtual-size of 4096 for the sector as an additional > >> performance 'hint', so nothing will even try to use > >> smaller i/o's than that. > >> > > > > Just format the filesystem with 4k sector size. > --- > Good idea, though.. I wanted to set it for the whole "disk"(array) > as it (multiple 4T drives) will be subdivided into multiple filesystems > and have lvm and a partition table under the file system(s), > so telling the kernel to only do 4K alloc+io's to the whole thing > would cover the most with the least. Also before you format it read the specification if you are using SATA drives. The disk is not necessarily aligned so that the physical/logical block boundary is as you'd expect. Some devices have a partial physical sector at the start in order to make it happen to work nicely with legacy software. Good fdisk tools know about this. It's in the ATA8 specification for identify. Alan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
