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

["Michael R. Hines" <mrhines@linux.vnet.ibm.com>]

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
nbd.c:nbd_send_negotiate():L562: option negotiation failed

- Michael