# Live Migration Fails With Error: "Unacceptable CPU Info: CPU Doesn't Have Compatibility.

## Problem

Attempts to perform a live migration of an instance fail with the following error.

{% tabs %}
{% tab title="None" %}

```none
Unacceptable CPU info: CPU doesn't have compatibility.
```

{% endtab %}
{% endtabs %}

## Environment

* Platform9 Managed OpenStack - v3.6.0 and Higher

## Cause

This error presents itself when CPU model/architecture differ between the source host and destination host even slightly.

## Resolution

1. Run the following command on the host where the VM currently resides to create an XML with the full CPU description.

{% tabs %}
{% tab title="None" %}

```none
# virsh capabilities > virsh-caps-[originHostname]-full.xml
```

{% endtab %}
{% endtabs %}

2. Edit the XML file you've generated deleting everything above "\[cpu]" and everything below "\[/cpu]".
3. Move the file to the destination host and run the following command which will tell you if there is a legitimate mismatch and on which side it lies.

{% tabs %}
{% tab title="None" %}

```none
# virsh cpu-compare virsh-caps-[originHostname]-full.xml
```

{% endtab %}
{% endtabs %}

4. To determine the specific features that must be masked out, run the following command.

{% tabs %}
{% tab title="None" %}

```none
# virsh cpu-baseline virsh-caps-[originHostname]-full.xml
```

{% endtab %}
{% endtabs %}

5. Mask out the features that do not appear in the output of the command in Step #4 and attempt to migrate the VM again.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://platform9.com/kb/pmo/solution/live-migration-fails-with-error-unacceptable-cpu-info-cpu-doesn.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.