Date: Tue, 7 Dec 2010 13:10:58 +0100 From: Erik Trulsson <ertr1013@student.uu.se> To: Andriy Gapon <avg@freebsd.org> Cc: Bruce Cran <bruce@cran.org.uk>, src-committers@freebsd.org, Pawel Jakub Dawidek <pjd@freebsd.org>, John Baldwin <jhb@freebsd.org>, svn-src-all@freebsd.org, Ivan Voras <ivoras@freebsd.org>, svn-src-head@freebsd.org, Alexander Motin <mav@freebsd.org> Subject: Re: svn commit: r216230 - head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs Message-ID: <20101207121058.GA53449@owl.midgard.homeip.net> In-Reply-To: <4CFE2110.8020108@freebsd.org> References: <AANLkTine9rGq_cM4ruFXYq=-F7cMXcQAr-zKHuWoQs2z@mail.gmail.com> <20101206195327.GD1936@garage.freebsd.pl> <201012061518.49835.jhb@freebsd.org> <4CFD514E.8010103@FreeBSD.org> <20101207095137.GC1700@garage.freebsd.pl> <4CFE0B9E.3060808@FreeBSD.org> <20101207110410.GE1700@garage.freebsd.pl> <4CFE1B0F.90908@FreeBSD.org> <20101207115106.GB68479@muon.cran.org.uk> <4CFE2110.8020108@freebsd.org>
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On Tue, Dec 07, 2010 at 01:57:04PM +0200, Andriy Gapon wrote: > on 07/12/2010 13:51 Bruce Cran said the following: > > 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? > > > > No. > And another reason is that modern drives do not actually report any CHS > parameters, so I don't even know where we get them and how we (pretend to) know > we track boundaries are. Modern drives do actually report CHS parameters. The values reported rarely (if ever) have any relationship whatsoever to reality, but they are reported. I guess the reason for them still being reported is to satisfy old systems that do not undestand LBA and insist on getting CHS parameters. -- <Insert your favourite quote here.> Erik Trulsson ertr1013@student.uu.se
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