Date: Thu, 18 Feb 2010 10:57:25 -0800 From: Matt Reimer <mattjreimer@gmail.com> To: Dan Naumov <dan.naumov@gmail.com> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org>, rnoland@freebsd.org Subject: Re: booting off a ZFS pool consisting of multiple striped mirror vdevs Message-ID: <f383264b1002181057y48e56cebv1c8bbb1c0fe9d1d2@mail.gmail.com> In-Reply-To: <cf9b1ee01002160038o25e17bc8sd54e66be7c67f859@mail.gmail.com> References: <cf9b1ee01002160038o25e17bc8sd54e66be7c67f859@mail.gmail.com>
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On Tue, Feb 16, 2010 at 12:38 AM, Dan Naumov <dan.naumov@gmail.com> wrote:
> > I don't know, but I plan to test that scenario in a few days.
> >
> > Matt
>
> Please share the results when you're done, I am really curious :)
>
Booting from a stripe of two raidz vdevs works:
FreeBSD/i386 boot
Default: doom:/boot/zfsloader
boot: status
pool: doom
config:
NAME STATE
doom ONLINE
raidz1 ONLINE
label/doom-0 ONLINE
label/doom-1 ONLINE
label/doom-2 ONLINE
raidz1 ONLINE
label/doom-3 ONLINE
label/doom-4 ONLINE
label/doom-5 ONLINE
I'd guess a stripe of mirrors would work fine too. If I get a chance I'll
test that combo.
> If booting of a stripe of 3 mirrors should work assuming no BIOS bugs,
> can you explain why is booting off simple stripes (of any number of
> disks) currently unsupported? I haven't tested that myself, but
> everywhere I look seems to indicate that booting off a simple stripe
> doesn't work or is that "everywhere" also out of date after your
> changes? :)
It's probably unsupported in Solaris/OpenSolaris because of their
bootloader. Our bootloader is completely different from theirs and so is not
subject to those restrictions in the ZFS docs.
The bottom line is that I think FreeBSD can boot from pretty much any
configuration, except possibly from systems with huge numbers of disks.
Matt
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