Alignment size?

[Christoph Hellwig]

On Fri, Aug 13, 2010 at 09:39:15PM +1000, Dave Chinner wrote:
> The workaround old versions of mkfs.xfs used was to create the fs
> with a sector size of 4k when it detected md raid5 underneath it so
> the sb and ag headers were all 4k aligned and sized, just like the
> rest of the filesystem....

That workaround is still in latests mkfs.xfs if you build against
the internal libdisk instead of libblkid.  And that's the case at
least for Debian, and probably a few other distributions as well.