# Instances Enter a Paused State on the Hypervisor

## Problem

Instances running on a hypervisor go into a **paused** state. The following error is observed in the */var/log/pf9/ostackhost.log*.

{% tabs %}
{% tab title="Javascript" %}

```javascript
2021-08-31 09:40:12.849 ERROR nova.compute.manager [...] [instance: c67fc199-c897-4b42-8305-8a90f2473a23] Cannot reboot instance: Failed to read or write disk info file: [Errno 28] No space left on device: '/opt/pf9/data/instances/c67fc199-c897-4b42-8305-8a90f2473a23/disk.info.tmp': nova.exception.DiskInfoReadWriteFail: Failed to read or write disk info file: [Errno 28] No space left on device: '/opt/pf9/data/instances/c67fc199-c897-4b42-8305-8a90f2473a23/disk.info.tmp'
```

{% endtab %}
{% endtabs %}

## Environment

* Platform9 Managed OpenStack - All Versions
* Nova

## Cause

The instances entered a **paused** state because there is no available disk space left on the *instances* mountpoint. When this happens, the instance state is reported as **ACTIVE** in the UI but the instances are in a **paused** state on the hypervisor.

## Resolution

1. Provision additional space to the *instances* mountpoint on the hypervisor.
2. Run the following commands for each instance present on the affected hypervisor to bring the instances back into a **running** state.

{% tabs %}
{% tab title="Javascript" %}

```javascript
# openstack server pause <server_uuid>
# openstack server unpause <server_uuid>
```

{% endtab %}
{% endtabs %}


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