hi,i have a question if failed in migration using post-copy mode,is there some way to restore the memory data back to soucre VM?
发自我的小米 在 Vladimir Sementsov-Ogievskiy <vsement...@yandex-team.ru>，2022年9月10日 下午6:18写道： On 9/10/22 09:35, liuhaiwei wrote: > From: liuhaiwei <liuhai...@inspur.com> > > bug description as https://gitlab.com/qemu-project/qemu/-/issues/1203 > Usually,we use the precopy or postcopy mode to migrate block dirty bitmap. > but if block-dirty-bitmap size more than threshold size,we cannot entry the > migration_completion in migration_iteration_run function > To solve this problem, we can setting the pending size to a fake > value(threshold-1 or 0) to tell migration_iteration_run function to entry > the migration_completion,if pending size > threshold size > Actually, bitmaps migrate in postcopy. So, you should start postcopy for it to work (qmp command migrate-start-postcopy). This command simply set the boolean variable, so that in migration_iteration_run() we'll move to postcopy when needed. So, you can start this command immediately after migrate command, or even before it, but after setting the "dirty-bitmaps" capability. Fake pending is a wrong thing to do, it means that you will make downtime to be larger than expected. -- Best regards, Vladimir
