Date: Fri, 21 Dec 2007 13:50:59 +0100 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Dmitry Morozovsky <marck@rinet.ru> Cc: current@FreeBSD.org Subject: Re: gnop Q Message-ID: <20071221125058.GA5852@garage.freebsd.pl> In-Reply-To: <20071220232913.X82597@woozle.rinet.ru> References: <20071220232913.X82597@woozle.rinet.ru>
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On Thu, Dec 20, 2007 at 11:34:10PM +0300, Dmitry Morozovsky wrote:
> Hi there Pawel and colleagues,
>=20
> am I right in thinking that there's currently no way to iron gnop provide=
r in=20
> meta-data?
>=20
> I'm thinking of creating the following geom tree:
>=20
> ad{4,6,8,10,12}f
> |
> +> raid3/r0f --+
> |
> ad12b |
> | |
> +> ad12b.nop --+
> +> r0f.journal
>=20
> because journal sector size should be equal to data sector size, which is=
in=20
> this case 2k.
>=20
> ad{4,6,8,10}b are used as two gmirrored swaps
>=20
> Any thoughts/hints? Thanks in advance.
I'd just create small partition at the begining of raid3/r0f for
journal. What you propose is not best because:
1. Journal is on the same disk as one of the RAID components.
2. Journal is not protected with RAID - ad12 dies and your whole system
will die.
My suggestion is to create small (~2GB) raid3/r0fa and big raid3/r0fd.
Then use raid3/r0fa as journal provider and raid3/r0fd as data provider.
--=20
Pawel Jakub Dawidek http://www.wheel.pl
pjd@FreeBSD.org http://www.FreeBSD.org
FreeBSD committer Am I Evil? Yes, I Am!
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