On Sun, Nov 03, 2013 at 04:01:36AM +0000, Zhanghaoyu (A) wrote: > I read below words on the report of <KVM Live Migration: Weather forecast > (May 29, 2013)>, > We were going to remove the old block-migration code > Then people fixed it > Good: it works now > Bad: We have to maintain both > It uses the same port than migration > You need to migrate all/none of block devices > > The old block-migration code said above is that in block-migration.c?
Yes. > What are the reasons of removing the old block-migration code? Buggy > implementation? Or need to migrate all/none of block devices? Buggy and tightly coupled with the live migration code, making it hard to modify either area independently. > What's the substitutional method? drive_mirror? drive_mirror over NBD is an alternative. There are security and integration challenges with those approaches but libvirt has added drive-mirror block migration support. Stefan
