Re: [Qemu-devel] [PATCH 00/10] Quorum disk image corruption resiliency

[Stefan Hajnoczi]

On Tue, Aug 7, 2012 at 2:44 PM, Benoît Canet <address@hidden> 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.

If you make the quorum setting configurable, then this can replace
blkverify.  n=2 is blkverify, n=3 is your current patch series, n/m is
also possible where n=number of mirrors and m=threshold needed to
achieve quorum.

Stefan