Date: Mon, 11 Mar 2013 11:09:22 -0700 From: Cody Ritts <cr@caltel.com> To: freebsd-fs@freebsd.org Subject: Re: Aligning MBR for ZFS boot help Message-ID: <513E1DD2.7030609@caltel.com> In-Reply-To: <513D0E90.5090105@platinum.linux.pl> References: <513C1629.50501@caltel.com> <513D0E90.5090105@platinum.linux.pl>
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On 3/10/13 3:52 PM, Adam Nowacki wrote: > I don't think zfsboot is aware of BSD disklabel (offsets other than 0 > won't boot). Is there any reason you are using BSD disklabel and not two > partition MBR? The reason is because every example I saw used labels. I just tried it, and it does not boot. I get: FreeBSD/x86 ZFS enabled bootstrap loader. Revision 1.1 ZFS: can't find pool by guid. > I also don't think there is any merit in aligning to 1MiB. Most ZFS IOs > will be aligned to sector size (ashift). Unless ZFS pool is created with > higher ashift then the 63 sector offset is as good as any. Aligning to the Erase block: http://blog.nuclex-games.com/2009/12/aligning-an-ssd-on-linux/ Also I will be forcing ashift to 12 using the gnop trick. If you still feel that is not necessary, I would be interested in knowing why? Thanks, Cody
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