Date: Sat, 8 Oct 2011 12:55:43 +0400 From: Lev Serebryakov <lev@FreeBSD.org> To: Daniel Kalchev <daniel@digsys.bg> Cc: freebsd-current@FreeBSD.org, perryh@pluto.rain.com, ivoras@FreeBSD.org, freebsd-geom@FreeBSD.org Subject: Re: RFC: Project geom-events Message-ID: <1993293883.20111008125543@serebryakov.spb.ru> In-Reply-To: <4E8F5D82.7050906@digsys.bg> 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> <1822982078.20111007234412@serebryakov.spb.ru> <4E8F5D82.7050906@digsys.bg>
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Hello, Daniel. You wrote 8 =EE=EA=F2=FF=E1=F0=FF 2011 =E3., 0:13:54: >>>> 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. > Then, "by standard" GPT cannot coexist with GLABEL. Such setup should be > disallowed, or at least big nasty message that you have just shoot=20 > yourself in the leg should be output. (period) Ok, maybe adding check to geom_part, that it is used on rank-1 provider (whole disk) is not so bad idea. But it then raise question how to install FreeBSD on software mirror, what is useful. But could bite you sometimes... Hm... --=20 // Black Lion AKA Lev Serebryakov <lev@FreeBSD.org>
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