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Date: Fri, 10 Aug 2012 19:45:51 +0200
From: =?iso-8859-1?Q?Beno=EEt?= Canet <benoit.canet@irqsave.net>
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Subject: Re: [Qemu-devel] [PATCH 00/10] Quorum disk image corruption
 resiliency
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To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: kwolf@redhat.com, =?iso-8859-1?Q?Beno=EEt?= Canet <benoit.canet@gmail.com>, stefanha@linux.vnet.ibm.com, qemu-devel@nongnu.org, blauwirbel@gmail.com, anthony@codemonkey.ws, pbonzini@redhat.com, eblake@redhat.com, afaerber@suse.de

Le Wednesday 08 Aug 2012 =E0 15:55:58 (+0100), Stefan Hajnoczi a =E9crit =
:
> On Tue, Aug 7, 2012 at 2:44 PM, Beno=EEt Canet <benoit.canet@gmail.com>=
 wrote:
> > This patchset create a block driver implementing a quorum using three=
 qemu disk
> > images. Writes are mirrored on the three files.
> > For the reading part the three files are read at the same time and a =
vote is
> > done to determine which is the majority qiov version. It then return =
this
> > majority version to the upper layers.
> > When three differents versions of the data are returned by the lower =
layer the
> > quorum is broken and the read return -EIO.
>=20
> If you make the quorum setting configurable, then this can replace
> blkverify.  n=3D2 is blkverify, n=3D3 is your current patch series, n/m=
 is
> also possible where n=3Dnumber of mirrors and m=3Dthreshold needed to
> achieve quorum.

I am working on making the quorum settings configurable.
I will post the new patchset next week.

Beno=EEt

>=20
> Stefan
>=20