Date: Wed, 18 Jun 2003 21:58:40 +0200 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: Nate Lawson <nate@root.org> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/geom geom_fox.c src/sys/modules/geom Makefile src/sys/modules/geom/geom_fox Makefile src/sys/conf NOTES files options Message-ID: <43230.1055966320@critter.freebsd.dk> In-Reply-To: Your message of "Wed, 18 Jun 2003 12:53:52 PDT." <20030618125009.K56972@root.org>
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In message <20030618125009.K56972@root.org>, Nate Lawson writes:
>On Wed, 18 Jun 2003, Poul-Henning Kamp wrote:
>> Add "GEOM_FOX", a class which detects and selects between multiple
>> redundant paths to the same device.
>>
>> This class reacts to a label in the first sector of the device,
>> which is created the following way:
>>
>> # "0123456789abcdef012345..."
>> # "<----magic-----><-id-...>
>> echo "GEOM::FOX someid" | dd of=/dev/da0 conv=sync
>
>This looks interesting. Have you shown this to gordon@ who is adding
>something similar to FFS? It might be good to have a generalized config
>tool.
>
>Won't the location you've chosen interfere with an MBR on i386 drives?
>Is it possible to pick another space (i.e. FFS label, {bsd,sun}label
>fields, GPT)?
No, the FOX method strips off that sector so you will not see it in
the topside device.
>You're right in that it will be a while before disk devices handle
>multipathing themselves. It would be great if you could help with making
>device_t support this kind of operation.
No way Jose! I have enough on my plate without adding newbus to the mix.
--
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.
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