On 08/02/2012 04:16 AM, Benoît Canet wrote: > This patchset create a block driver implementing a qorum using three qemu disk
s/qorum/quorum/g throughout the series, including subject line > 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 majoritary qiov version. It then return this s/majoritary/majority/ > majoritary version to the upper layers. > When three differents versions of the data are returned by the lower layer the s/differents/different/ > qorum is broken and the read return -EIO. > > The goal of this patchset is to be turned in a QEMU block filter living just > above raw-*.c and below qcow2/qed when the required infrastructure will be > done. > > Main use of this feature will be people using NFS appliances which can be > subjected to bitflip errors. > > usage: -drive file=qorum:image1.raw:image2.raw:image3.raw,if=virtio,cache=none How does this fit with snapshots? Does a snapshot of a quorum require passing in three filenames, one for each of the three sources? -- Eric Blake ebl...@redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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