Features/PostCopyLiveMigration

summary

post-copy based live migration

owner

• Name: Dave Gilbert
• Email: dgilbert@redhat.com

description

This is yet another live migration mechanism for QEMU/KVM, which implements the migration technique known as "postcopy" or "lazy" migration. Just after the "migrate" command is invoked, the execution host of a VM is instantaneously switched to a destination host.

design

The migration procedure looks like

• start migration: stop the guest VM on the source and send the machine states except guest RAM to the destination
• resume the guest VM on the destination without guest RAM contents
• Hook guest access to pages, and pull page contents from the source. This continues until all the pages are pulled to the destination

future enhancement

• optimization

links

• Previous postcopy implementation as part of Yabusame
• This work is part of the ORBIT project