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From: Lev Serebryakov <lev@FreeBSD.org>
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Cc: freebsd-geom@freebsd.org, lev@freebsd.org, ivoras@freebsd.org,
	freebsd-current@freebsd.org, daniel@digsys.bg
Subject: Re: RFC: Project geom-events
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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>