Date: Fri, 7 Oct 2011 23:44:12 +0400 From: Lev Serebryakov <lev@FreeBSD.org> To: perryh@pluto.rain.com Cc: freebsd-geom@freebsd.org, lev@freebsd.org, ivoras@freebsd.org, freebsd-current@freebsd.org, daniel@digsys.bg Subject: Re: RFC: Project geom-events Message-ID: <1822982078.20111007234412@serebryakov.spb.ru> In-Reply-To: <4e8f076e.XGNH7dUgsC/mhr1j%perryh@pluto.rain.com> References: <1927112464.20111004220507@serebryakov.spb.ru> <4E8B7A27.5070908@quip.cz> <344794801.20111005101957@serebryakov.spb.ru> <4E8C1426.60107@quip.cz> <251861322.20111005125825@serebryakov.spb.ru> <4E8C6E85.90005@quip.cz> <CACdU%2Bf8mA1wLUnHVyrJwaf89ahf2oc_904=8mme7kkBLxLSCCQ@mail.gmail.com> <4E8CD662.90202@quip.cz> <j6k252$hpm$1@dough.gmane.org> <4E8D9136.6040200@digsys.bg> <672948039.20111006175334@serebryakov.spb.ru> <4e8f076e.XGNH7dUgsC/mhr1j%perryh@pluto.rain.com>
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Hello, Perryh. You wrote 7 =EE=EA=F2=FF=E1=F0=FF 2011 =E3., 18:06:38: >> GPT (and MBR) metadata placement is dictated from outside world, >> where is no GEOM and geom_label. They INTENDED to be used on DISKS. >> BIOSes should be able to find it :) > Certainly GPT and MBR must place an instance of the partition table > where the BIOS expects it, but there's no immediately obvious reason > why they must regard that instance as their GEOM metadata. GPT puts > a second copy in the provider's last block, and AFAICT it could just > as well use _that_ instance -- or even a differently-formatted block > that included the same data -- as the primary. MBR could do likewise. I have deja-vu, that I answered this. Please, read standard. GPT _must_ be placed twice -- at first and last sectors (really, more than one sectors). By standard. Secondary copy must be at end of disk. Period. --=20 // Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>
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