On 03/13/2015 05:05 PM, Fam Zheng wrote: > On Fri, 03/13 17:01, Wen Congyang wrote: >> 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. > > It is bdrv_co_copy_on_readv that moves data.
Does the job stream move the data from base to top? Thanks Wen Congyang > > Fam > . >
