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Date: Wed, 25 Mar 2015 14:24:36 +0000
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Message-ID: <20150325142436.GG2313@work-vm>
References: <1427276174-9130-1-git-send-email-wency@cn.fujitsu.com>
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Subject: Re: [Qemu-devel] [RFC PATCH COLO v2 00/13] Block replication for
 continuous checkpoints
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To: Wen Congyang <wency@cn.fujitsu.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Fam Zheng <famz@redhat.com>, Lai Jiangshan <laijs@cn.fujitsu.com>, qemu block <qemu-block@nongnu.org>, Jiang Yunhong <yunhong.jiang@intel.com>, Dong Eddie <eddie.dong@intel.com>, qemu devel <qemu-devel@nongnu.org>, Max Reitz <mreitz@redhat.com>, Stefan Hajnoczi <stefanha@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Yang Hongyang <yanghy@cn.fujitsu.com>

* Wen Congyang (wency@cn.fujitsu.com) wrote:
> Block replication is a very important feature which is used for
> continuous checkpoints(for example: COLO).
> 
> Usage:
> Please refer to docs/block-replication.txt
> 
> You can get the patch here:
> https://github.com/wencongyang/qemu-colo/commits/block-replication-v2

Do you have a branch with this code ontop of the main colo work?

Dave

> 
> Changs Log:
> V2:
> 1. Redesign the secondary qemu(use image-fleecing)
> 2. Use Error objects to return error message
> 3. Address the comments from Max Reitz and Eric Blake
> 
> Wen Congyang (13):
>   docs: block replication's description
>   quorum: allow ignoring child errors
>   NBD client: connect to nbd server later
>   Add new block driver interfaces to control block replication
>   quorum: implement block driver interfaces for block replication
>   NBD client: implement block driver interfaces for block replication
>   allow writing to the backing file
>   Allow creating backup jobs when opening BDS
>   block: Parse "backing_reference" option to reference existing BDS
>   Backup: clear all bitmap when doing block checkpoint
>   qcow2: support colo
>   skip nbd_target when starting block replication
>   Don't allow a disk use backing reference target
> 
>  block.c                    | 242 +++++++++++++++++++++++-
>  block/Makefile.objs        |   2 +-
>  block/backup.c             |  12 ++
>  block/nbd.c                | 171 +++++++++++++++--
>  block/qcow2.c              | 447 ++++++++++++++++++++++++++++++++++++++++++++-
>  block/qcow2.h              |   6 +
>  block/quorum.c             | 143 ++++++++++++++-
>  docs/block-replication.txt | 147 +++++++++++++++
>  include/block/block.h      |   5 +
>  include/block/block_int.h  |  13 ++
>  include/qemu/hbitmap.h     |   8 +
>  qapi/block.json            |  16 ++
>  tests/qemu-iotests/051     |  13 ++
>  tests/qemu-iotests/051.out |  13 ++
>  util/hbitmap.c             |  19 ++
>  15 files changed, 1230 insertions(+), 27 deletions(-)
>  create mode 100644 docs/block-replication.txt
> 
> -- 
> 2.1.0
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK