On 14/01/2015 03:41, Zhang Haoyu wrote: > Hi, Paolo, > what's advantages of drive_mirror over traditional mechanism implemented in > block-migration.c ? > Why libvirt use drive_mirror instead of traditional iterative mechanism as > the default way > of live migration with non-shared storage?
1) Being able to choose which block devices are migrated, and whether they are migrated incrementally or not. 2) Finer-grain control the parameters of block migration (dirty bitmap granularity). 3) Block and RAM migration do not share the same socket and thus can more easily be parallelized. Note that 1-2 are not yet supported by libvirt as far as I remember. Paolo
