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Date:      Mon, 28 Jul 2014 00:25:39 +0400 (MSK)
From:      Dmitry Morozovsky <marck@rinet.ru>
To:        Dave Hayes <dave@jetcafe.org>
Cc:        Warren Block <wblock@wonkity.com>, freebsd-stable@freebsd.org
Subject:   Re: Gmirror + gpart corruption on 9.3-PRE
Message-ID:  <alpine.BSF.2.00.1407280021370.33904@woozle.rinet.ru>
In-Reply-To: <53D2E560.5090100@jetcafe.org>
References:  <53D1BDB2.7030906@jetcafe.org> <alpine.BSF.2.11.1407242120070.3624@wonkity.com> <53D2E560.5090100@jetcafe.org>

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On Fri, 25 Jul 2014, Dave Hayes wrote:

> > > At 9.3-PRERELEASE #0 r268066M I've been trying unsucessfuly to set up
> > > a brand shiny new gmirror + gpt style Raid 0 mirror using the
> > > following procedure on a disk
> > > 
> > > gpart create -s gpt ada0
> > > ( shows 931G of space)
> > > gpart add -s 96G -t freebsd-swap -l swap0 ada0
> > > gpart add -t freebsd-ufs -l rw0 ada0
> > > gpart create -s gpt ada1
> > > gpart add -s 96G -t freebsd-swap -l swap1 ada1
> > > gpart add -t freebsd-ufs -l rw1 ada1
> > > gmirror label swap /dev/ada0p1 /dev/ada1p1
> > > gmirror label rw   /dev/ada0p2 /dev/ada1p2
> 
> I need to be clearer. Above is the point at which the corrupt table message is
> encountered. I believe the above is the equivalent of your method, and hence
> your method may not work on 9.3-PRE and above. If you happen to be able to
> test this, I'd be curious as to the results.
> 
> I'm going to try gmirroring the entire disk and and using BSD labels for
> separate partitions. I think this will have the effect I want, and it's worth
> a test.

... or, possibly better, you could mark both your disks with gpart partitioning 
(maybe using -a1m to both align partitions and make them let some free gap at 
the end of disks), and then just gmirror partitions, as you did before.

Or, did I miss something?


-- 
Sincerely,
D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer:                                 marck@FreeBSD.org ]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru ***
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