Re: [Qemu-devel] [PATCH] block/quorum: add simple read pattern support

[Eric Blake <eblake@redhat.com>]

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On 07/10/2014 09:01 PM, Liu Yuan wrote:
> This patch adds single read pattern to quorum driver and quorum vote is default
> pattern.
> 
> For now we do a quorum vote on all the reads, it is designed for unreliable
> underlying storage such as non-redundant NFS to make sure data integrity at the
> cost of the read performance.
> 

> E.g, Enable single read pattern on 2 children,
> 
> -drive driver=quorum,children.0.file.filename=0.qcow2,\
> children.1.file.filename=1.qcow2,read-pattern=single,vote-threshold=1
> 
> [1] http://en.wikipedia.org/wiki/Distributed_Replicated_Block_Device
> 
> Cc: Benoit Canet <benoit@irqsave.net>
> Cc: Kevin Wolf <kwolf@redhat.com>
> Cc: Stefan Hajnoczi <stefanha@redhat.com>
> Signed-off-by: Liu Yuan <namei.unix@gmail.com>
> ---
>  block/quorum.c | 174 +++++++++++++++++++++++++++++++++++++++++----------------
>  1 file changed, 125 insertions(+), 49 deletions(-)

That covers the command line, but what about the *.json changes to allow
QMP to select this mode when hot-plugging?

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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