From owner-cvs-all@FreeBSD.ORG  Sat May  5 18:08:04 2007
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To: Pawel Jakub Dawidek <pjd@FreeBSD.org>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Sat, 05 May 2007 17:02:19 GMT."
	<200705051702.l45H2JhR047993@repoman.freebsd.org> 
Date: Sat, 05 May 2007 18:08:00 +0000
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Cc: cvs-src@FreeBSD.org, src-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: Re: cvs commit: src/sys/sys disk.h src/sys/geom geom_dev.c 
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In message <200705051702.l45H2JhR047993@repoman.freebsd.org>, Pawel Jakub Dawid
ek writes:

>  First two are self-explanatory, but the last one might not be. Here are
>  properties of provider's ident:
>  
>  - ident value should not be based on on-disk metadata; in other words
>    copying whole data from one disk to another should not yield the same
>    ident for the other disk,
>  - there could be more than one provider with the same ident, but only if
>    they point at exactly the same physical storage, this is the case for
>    multipathing for example,

   - If the provider cannot guarantee these two requirements, no
     ident shall be offered.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.