Re: [Qemu-devel] [PATCH COLO-BLOCK v7 00/17] Block replication for continuous checkpoints

[Wen Congyang <wency@cn.fujitsu.com>]

On 07/07/2015 08:25 AM, Michael R. Hines wrote:
> On 07/04/2015 07:46 AM, Wen Congyang wrote:
>> At 2015/7/3 23:30, Dr. David Alan Gilbert Wrote:
>>> * 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-v7
>>>>
>>>> You can get ths patch with framework here:
>>>> https://github.com/wencongyang/qemu-colo/commits/colo_framework_v7.2
>>>
>>> Hi,
>>>    I seem to be having problems with the new listed syntax on the wiki;
>>> on the secondary I'm getting the error
>>>
>>>   Block format 'replication' used by device 'virtio0' doesn't support the option 'export'
>>>
>>> ./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 \
>>>       -device virtio-rng-pci \
>>>       -drive if=none,driver=raw,file=/home/localvms/bugzilla.raw,id=colo1,cache=none,aio=native \
>>>       -drive if=virtio,driver=replication,mode=secondary,export=colo1,throttling.bps-total-max=70000000,\
>>> file.file.filename=$TMPDISKS/colo-active-disk.qcow2,\
>>> file.driver=qcow2,\
>>> file.backing.file.filename=$TMPDISKS/colo-hidden-disk.qcow2,\
>>> file.backing.driver=qcow2,\
>>> file.backing.backing.backing_reference=colo1,\
>>> file.backing.allow-write-backing-file=on \
>>>       -incoming tcp:0:8888
>>
>> Sorry, the option export is removed, because we use the qmp command nbd-server-add to let a BB be NBD server.
>>
> 
> Still doesn't work. The server says:
> 
> nbd.c:nbd_receive_options():L447: read failed

This log is very stange. The NBD client connects to NBD server, and NBD server wants to read data
from NBD client, but reading fails. It seems that the connection is closed unexpectedly. Can you
give me more log and how do you use it?

Thanks
Wen Congyang

> nbd.c:nbd_send_negotiate():L562: option negotiation failed
> 
> - Michael
> 
> .
>