On May 25, 2011, at 8:12 AM, Andriy Gapon wrote: > on 24/05/2011 21:12 Marcel Moolenaar said the following: >> With respect to the creation: >> >> Since out synthesized geometry is not necessarily the same >> as other OSes, we could opt to synthesize a geometry that >> has a track size (= sectors/track) that is a multiple of 8 >> (to play nice with 4K sectors), and/or take the stripe >> size of the underlying GEOM into account. This fundamentally >> doesn't change a thing for MBR, but has the side effect of >> achieving some of the goals *and* automatically works for >> EBR as well. >> >> Thus: rather than hack MBR and forgetting about EBR and other >> schemes, maybe we only have to tweak the geometry synthesis >> to give people what they want without going over board. > > I don't think that currently we do synthesize any geometry in kernel. > I think that we just whatever BIOS/firmware/etc provides to us in some way.
Yes, we do. gpart makes sure that there's always a geometry and it adjusts the geometry based on information obtained from schemes. The geometry given by geom_disk (= ad or da) is typically the starting point. md does not have geometry information, causing certain tools to work less well. -- Marcel Moolenaar [email protected] _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-geom To unsubscribe, send any mail to "[email protected]"
