> For the complete documentation index, see [llms.txt](https://platform9.com/kb/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://platform9.com/kb/pmo/solution/vm-fails-to-start-with--volume-device-not-found-at--error.md).

# VM Fails to Start with 'Volume device not found at' Error

## Problem

* VM fails to start with below error:

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

```javascript
2023-05-26 04:58:46.360 ERROR nova.compute.manager [req-21a1e9fe-171d-4ba1-8147-1c46f1317240 brandon.cortese@comtechtel.com c4d] [instance: 8b3a0948-xxxx-4f6d-xxxx-54ae0c26cd67] Cannot reboot instance: Volume device not found at .: os_brick.exception.VolumeDeviceNotFound: Volume device not found at.
```

{% endtab %}
{% endtabs %}

## Environment

* Platform9 Managed OpenStack - v5.4.0 and Higher
* Volumes configured with iSCSI.

## Cause

The mentioned volume is not mounted on the host where the VM is running.

## Resolution

* Mount the volume on the host using below commands:

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

```javascript
# iscsiadm --mode discoverydb --type sendtargets --portal <TARGET> --discover|grep <volume_id>
# iscsiadm --mode node --targetname <volume_iqn> --portal <TARGET>:3260 --login
```

{% endtab %}
{% endtabs %}


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