FreeBSD's bhyve now moves running VMs between hosts with ~150ms downtime
Live-migration support in FreeBSD and bhyve coming
A working prototype brings live migration to bhyve on FreeBSD 15.1: a running amd64 guest shifts between two hosts over TCP, pausing only for the final stop-and-copy. Built on experimental snapshot support plus new dirty-page tracking in the vmm kernel module, a slowly dirtying 512 MiB guest saw roughly 138–171 ms of downtime. Published as a WIP RFC, it still lacks transport authentication, a full compatibility contract, and hardened dirty-log proofs before upstreaming.
Before GO, a failed migration can resume the source guest. The destination does not start the guest if it does not receive that commit message.
- als0
Also related is Propolis from Oxide who worked on live migration with Bhyve https://github.com/oxidecomputer/propolis
- JohnDohnBohn
Looks like this could really become a game changer for the FreeBSD folks using bhyve. The author often complained about this missing feature and he was also contributing to the Sylve project. Looks like he's crafting something.
- e12e
Anyone heard anything from dragonflyBSD lately? This sounds like something that might go well with HammerFS?