> For the complete documentation index, see [llms.txt](https://docs.layeronecloud.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.layeronecloud.com/pve-microvm/ha.md).

# High Availability & Migration

Source project: `pve-microvm` (migrated from `docs/ha.md`). Run commands from the code checkout and directory specified below, not from this documentation repository.

## Offline migration <a href="#offline-migration" id="offline-migration"></a>

Microvms support offline migration between nodes on shared storage:

```bash
# VM must be stopped
qm migrate <vmid> <target-node>
```

Tested: z83ii ↔ borg, \~2 seconds on shared CIFS.

## HA support <a href="#ha-support" id="ha-support"></a>

```bash
# VM disks must be on shared storage (CIFS, NFS, etc.)
ha-manager add vm:<vmid> --group Intel --state started

# Relocate (stop → migrate → start)
ha-manager relocate vm:<vmid> <target-node>

# Remove from HA
ha-manager remove vm:<vmid>
```

## Limitations <a href="#limitations" id="limitations"></a>

* **No live migration** — QEMU microvm doesn't implement it
* **HA relocate** performs stop → migrate → start (2–10 s downtime)
* **Shared storage required** — all nodes must see the VM disk

## Tested flow <a href="#tested-flow" id="tested-flow"></a>

| Step                          | Result        |
| ----------------------------- | ------------- |
| Create on z83ii (shared CIFS) | ✅             |
| Offline migrate z83ii → borg  | ✅ (2 seconds) |
| Start on borg                 | ✅             |
| HA add + started              | ✅             |
| HA relocate borg → z83ii      | ✅             |
| VM running after relocate     | ✅             |


---

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