svn commit: r216230 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs

[Warner Losh]

From: Bruce Cran <bruce at cran.org.uk>
Subject: Re: svn commit: r216230 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
Date: Tue, 7 Dec 2010 11:51:06 +0000

> On Tue, Dec 07, 2010 at 01:31:27PM +0200, Alexander Motin wrote:
> > Not necessary. Some places indeed may have some legacy requirements,
> > for example, in theory MBR want partition to be aligned to "track
> > boundary" (but I've seen many pre-formatted SD cards with MBR
> > violating it to align partition to flash sector). Same time for BSD
> > label I see no problem to align partitions any way we want. I also
> > see no problems to make FAT cluster, UFS block/fragment, etc, to
> > match some sizes.
> 
> From a new installation of Windows 7 and FreeBSD CURRENT:
> 
> GEOM: ada0: partition 3 does not start on a track boundary.
> GEOM: ada0: partition 3 does not end on a track boundary.
> GEOM: ada0: partition 2 does not start on a track boundary.
> GEOM: ada0: partition 2 does not end on a track bounary.
> 
> Partition 2 is the reserved partition while 3 is an NTFS partition, both
> created in the Windows setup application.
> 
> Since Windows isn't bothering to align partitions do we still need to
> warn about it?

The geom warnings are totally bogus, and no conclusion about anything
can be drawn from them other than the disk partitions don't match the
*FAKE* geometry cam creates for the disk.

Warner