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Re: [Qemu-devel] [RFC PATCH COLO v2 00/13] Block replication for continu
From: |
Wen Congyang |
Subject: |
Re: [Qemu-devel] [RFC PATCH COLO v2 00/13] Block replication for continuous checkpoints |
Date: |
Wed, 1 Jul 2015 12:11:14 +0800 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 |
On 07/01/2015 11:09 AM, Michael R. Hines wrote:
> On 03/25/2015 04:36 AM, Wen Congyang 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
>>
>> 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
>>
>
> When I try this patch with the MicroCheckpointing codebase, I'm having
> trouble starting up the secondary/backup VM
> using the branch "block-replication-v7"
>
> $ qemu-system-x86_64 -drive if=none,driver=raw,file=file.raw,id=nbd_target1
> -drive
> if=virtio,driver=replication,mode=secondary,export=foo,file.file.filename=active_disk.qcow2,file.driver=qcow2,file.backing_reference.drive_id=nbd_target1,file.backing_reference.hidden-disk.file.filename=hidden_disk.qcow2,file.backing_reference.hidden-disk.driver=qcow2,file.backing_reference.hidden-disk.allow-write-backing-file=on
>
> Block format 'qcow2' used by device '' doesn't support the option
> 'backing_reference.hidden-disk.allow-write-backing-file'
>
> What am I doing wrong here?
The command is wrong. If you use the branch block-replication-v7, the command
line should like:
-drive
if=none,driver=raw,file=/data/images/kvm/suse/suse11_3.img,id=colo1,cache=none,aio=native
-drive
if=virtio,driver=replication,mode=secondary,throttling.bps-total-max=70000000,file.file.filename=/mnt/ramfs/active_disk.img,file.driver=qcow2,file.backing.file.filename=/mnt/ramfs/hidden_disk.img,file.backing.driver=qcow2,file.backing.allow-write-backing-file=on,file.backing.backing.backing_reference=colo1
Thanks
Wen Congyang
>
> - Michael
>
> .
>
- Re: [Qemu-devel] [RFC PATCH COLO v2 00/13] Block replication for continuous checkpoints,
Wen Congyang <=