Re: [Qemu-devel] [RFC PATCH 01/14] docs: block replication's description

[Wen Congyang]

On 03/11/2015 02:49 PM, Fam Zheng wrote:
> On Wed, 03/11 14:44, Wen Congyang wrote:
>> On 03/03/2015 03:59 PM, Fam Zheng wrote:
>>> On Tue, 03/03 15:53, Wen Congyang wrote:
>>>> I test qcow2_make_empty()'s performance. The result shows that it may
>>>> take about 100ms(normal sata disk). It is not acceptable for COLO. So
>>>> I think disk buff is necessary(just use it to replace qcow2).
>>>
>>> Why not tmpfs or ramdisk?
>>
>> Another problem:
>> After failover, secondary write request will be written in (active disk)?
>> It is better to write request to (nbd target). Is there any feature can
>> be reused to implement it?
> 
> You can use block commit or stream to move the data.

Can the job stream move the data? I don't find the write ops in block/stream.c.

Thanks
Wen Congyang

> 
> Fam
> 
> .
>