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. Fam