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Subject: Re: [Qemu-devel] [Qemu-block] [PATCH COLO-Block v6 07/16] Add new
 block driver interface to connect/disconnect the remote target
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To: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>, Fam Zheng <famz@redhat.com>, Wen Congyang <ghostwcy@gmail.com>, qemu block <qemu-block@nongnu.org>, Stefan Hajnoczi <stefanha@gmail.com>, Jiang Yunhong <yunhong.jiang@intel.com>, Dong Eddie <eddie.dong@intel.com>, qemu devel <qemu-devel@nongnu.org>, Max Reitz <mreitz@redhat.com>, Lai Jiangshan <laijs@cn.fujitsu.com>, Gonglei <arei.gonglei@huawei.com>, Stefan Hajnoczi <stefanha@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, Yang Hongyang <yanghy@cn.fujitsu.com>, zhanghailiang <zhang.zhanghailiang@huawei.com>

On 07/01/2015 04:11 PM, Dr. David Alan Gilbert wrote:
> * Wen Congyang (wency@cn.fujitsu.com) wrote:
>> On 07/01/2015 03:01 AM, Dr. David Alan Gilbert wrote:
>>> * Wen Congyang (wency@cn.fujitsu.com) wrote:
>>>> On 06/27/2015 03:03 AM, Dr. David Alan Gilbert wrote:
>>>
>>> <snip>
>>>
>>>>> Ah, I hadn't realised you could do that; so do you just do:
>>>>>
>>>>> migrate_set_parameter colo on
>>>>> migrate -d -b tcp:otherhhost:port
>>>>>
>>>>> How does the secondary know to feed that data straight into the disk without
>>>>> recording all the old data into the hidden-disk ?
>>>>
>>>> hidden disk and active disk will be made empty when starting block replication.
>>>
>>> Hmm, yes - I think I need to update to your current world; in the version
>>> from the end of May, I get a 'error while loading state for instance 0x0 of device 'block''
>>> if I try to use migrate -d -b 
>>> (the bdrv_write fails)
>>
>> Can you give me both primary and secondary qemu's command? I think the command line is wrong,
>> and disk migration fails.
>>
> 
> Primary:
> 
> ./try/bin/qemu-system-x86_64 -enable-kvm -nographic \
>      -boot c -m 4096 -smp 4 -S \
>      -name debug-threads=on -trace events=trace-file \
>      -netdev tap,id=hn0,script=$PWD/ifup-prim,\
> downscript=no,colo_script=$PWD/qemu/scripts/colo-proxy-script.sh,colo_nicname=em4 \
>      -device e1000,mac=9c:da:4d:1c:b5:89,id=net-pci0,netdev=hn0 \
>      -drive if=virtio,driver=quorum,read-pattern=fifo,no-connect=on,\
> cache=none,aio=native,\
> children.0.file.filename=./bugzilla.raw,\
> children.0.driver=raw,\
> children.1.file.driver=nbd,\
> children.1.file.host=ibpair,\
> children.1.file.port=8889,\
> children.1.file.export=colo1,\
> children.1.driver=replication,\
> children.1.mode=primary,\
> children.1.ignore-errors=on

Add id=nbd_target1 to primary disk option, and try it. Disk migration needs the same id to sync
the disk.

Thanks
Wen Congyang

> 
> 
> Secondary:
> 
> ./try/bin/qemu-system-x86_64 -enable-kvm -nographic \
>      -boot c -m 4096 -smp 4 -S \
>      -name debug-threads=on -trace events=trace-file \
>      -netdev tap,id=hn0,script=$PWD/ifup-slave,\
> downscript=no,colo_script=$PWD/qemu/scripts/colo-proxy-script.sh,colo_nicname=em4 \
>      -device e1000,mac=9c:da:4d:1c:b5:89,id=net-pci0,netdev=hn0 \
>      -drive if=none,driver=raw,file=bugzilla.raw,id=nbd_target1,cache=none,aio=native \
>      -drive if=virtio,driver=replication,mode=secondary,export=colo1,throttling.bps-total-max=70000000,\
> file.file.filename=/run/colo-active-disk.qcow2,\
> file.driver=qcow2,\
> file.backing_reference.drive_id=nbd_target1,\
> file.backing_reference.hidden-disk.file.filename=/run/colo-hidden-disk.qcow2,\
> file.backing_reference.hidden-disk.driver=qcow2,\
> file.backing_reference.hidden-disk.allow-write-backing-file=on \
>      -incoming tcp:0:8888
> 
> 
> Thanks,
> 
> Dave
> 
>>>>>> If the user uses mirror job, we don't cancel the mirror job now.
>>>>>
>>>>> It would be good to get it to work with mirror, that seems preferred these
>>>>> days to the old block migration.
>>>>
>>>> In normal migration, is mirror job created and cancelled by libvirt?
>>>
>>> Yes, I think so; you should be able to turn on full logging on libvirt and
>>> watch the qmp commands it sends.
>>
>> Supporting mirror job in my TODO list now. But I think we should focus the basci function now.
>>
>> Thanks
>> Wen Congyang
>>
>>>
>>> Dave
>>>
>>> --
>>> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
>>> .
>>>
>>
> --
> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
> .
>