Date: Tue, 26 May 2009 19:29:00 +0300 From: Andriy Gapon <avg@icyb.net.ua> To: hartzell@alerce.com Cc: FreeBSD Stable Mailing List <freebsd-stable@freebsd.org> Subject: Re: ZFS boot on zfs mirror Message-ID: <4A1C18CC.7080902@icyb.net.ua> In-Reply-To: <18972.5870.795005.186542@already.dhcp.gene.com> References: <29579856-69F7-4CDC-A52A-B414A40180ED@yellowspace.net> <4A1B0B4F.1020106@h3q.com> <ea7b7b810905260226g29e8cbf5ic75a59b979f6cd42@mail.gmail.com> <alpine.BSF.2.00.0905261353140.8940@woozle.rinet.ru> <18972.5870.795005.186542@already.dhcp.gene.com>
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on 26/05/2009 19:21 George Hartzell said the following: > Dmitry Morozovsky writes: > > On Tue, 26 May 2009, Mickael MAILLOT wrote: > > > > MM> Hi, > > MM> > > MM> i prefere use zfsboot boot sector, an example is better than a long talk: > > MM> > > MM> $ zpool create tank mirror ad4 ad6 > > MM> $ zpool export tank > > MM> $ dd if=/boot/zfsboot of=/dev/ad4 bs=512 count=1 > > MM> $ dd if=/boot/zfsboot of=/dev/ad6 bs=512 count=1 > > MM> $ dd if=/boot/zfsboot of=/dev/ad4 bs=512 skeep=1 seek=1024 > > MM> $ dd if=/boot/zfsboot of=/dev/ad6 bs=512 skeep=1 seek=1024 > > > > s/skeep/skip/ ? ;-) > > What is the reason for copying zfsboot one bit at a time, as opposed > to > > dd if=/boot/zfsboot of=/dev/ad4 bs=512 count=2 seek=1024 for the second part? and no 'count=1' for it? :-) [Just guessing] Apparently the first block of zfsboot is some form of MBR and the rest is zfs-specific code that goes to magical sector 1024. -- Andriy Gapon
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