# Live Migration Fails Due to RPC Timeout

## Problem

Attempts to perform a live migration of an instance fail with an error similar to the below on the source host.

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

```none
ERROR nova.compute.manager Pre live migration failed at fea5e264-bfb1-40cd-b1f0-d247845071af...TRACE nova.compute.manager MessagingTimeout: Timed out waiting for a reply to message ID f1e35e10f7c445e3810a115dc3204a24
```

{% endtab %}
{% endtabs %}

## Environment

* Platform9 Managed OpenStack - All Versions
* Volume-Backed Storage

## Cause

Attempting a live migration of an instance with multiple attached volumes may fail pre-migration checks due to an RPC timeout.

## Resolution

1. Increase the default RPC timeout of 60 seconds using an override in */opt/pf9/etc/nova/conf.d/nova\_override.conf*, as shown here.

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

```none
[DEFAULT]rpc_response_timeout = 120
```

{% endtab %}
{% endtabs %}

2. Restart the ***pf9-ostackhost*** service.

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

```none
# systemctl restart pf9-ostackhost
```

{% endtab %}
{% endtabs %}

3. Retry the migration operation and further increase the RPC timeout if necessary.

## Additional Information

For more information on Nova configuration options, please refer to the following OpenStack documentation.

[Nova (Pike) Configuration Options](https://docs.openstack.org/nova/pike/configuration/config.html)


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