On May 19, 2012, at 11:36 AM, rozhuk...@gmail.com wrote: > Do not use MBR (or manually do all to align). > 63 - not 4k aligned.
Right now, the "-a" alignment option for "gpart add" is broken when used with MBR partitions. It looks like the gpart command uses it to correctly align the start/end, but then the actual MBR geom code does another alignment pass that rounds the start/size to a multiple of gpt_sectors, which defaults to 63. This seems problematic. It's tempting to change sys/geom/part/g_part_mbr.c so that it skips this additional alignment when the geometry has defaulted. Something like this: Index: sys/geom/part/g_part_mbr.c =================================================================== --- part/g_part_mbr.c (revision 235597) +++ part/g_part_mbr.c (working copy) @@ -211,6 +211,7 @@ start = gpp->gpp_start; size = gpp->gpp_size; + if (sectors != 63 || basetable->gpt_heads != 255) { if (size < sectors) return (EINVAL); if (start % sectors) { @@ -221,6 +222,7 @@ size = size - (size % sectors); if (size < sectors) return (EINVAL); + } if (baseentry->gpe_deleted) bzero(&entry->ent, sizeof(entry->ent)); I'm not really certain I understand all of the implications of this change, though. Tim _______________________________________________ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to "freebsd-hackers-unsubscr...@freebsd.org"