On Mon, Aug 30, 2010 at 3:05 PM, Ray Van Dolson <rvandol...@esri.com> wrote: > I want to "fix" (as much as is possible) a misalignment issue with an > X-25E that I am using for both OS and as an slog device.
It's pretty easy to get the alignment right fdisk uses a default of 63/255/*, which isn't easy to change. This makes each cylinder ( 63 * 255 * 512b ). You want ( $cylinder_offset ) * ( 63 * 255 * 512b ) / ( $block_alignment_size ) to be evenly divisible. For a 4k alignment you want the offset to be 8. With fdisk, create your SOLARIS2 partition that uses the entire disk. The partition will be from cylinder 1 to whatever. Cylinder 0 is used for the MBR, so it's automatically un-aligned. When you create slices in format, the MBR cylinder isn't visible, so you have to subtract 1 from the offset, so your first slice should start on cylinder 7. Each additional cylinder should start on a multiple of 8, minus 1. eg: 63, 1999, etc. It doesn't matter if the end of a slice is unaligned, other than to make aligning the next slice easier. -B -- Brandon High : bh...@freaks.com _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
