# Resize a volume

This tutorial describes steps to resize a <code class="expression">space.vars.product\_name</code> block storage volume.

When using <code class="expression">space.vars.product\_name</code> block storage volumes, it is possible to resize or extend a volume - both in use volume (live resize) as well as volume that is not currently in used can be resized.

## What to Know Before Resizing a Volume

Regardless of how you resize the volume, it's important to note that resizing a volume at the block level does not automatically extend the file system inside the virtual machine. After the underlying block storage volume has been successfully resized, **you must manually perform a file system resize operation** within the virtual machine to utilize the newly allocated disk space.

{% hint style="danger" %}
**Important**

Resizing a volume does not automatically extend the file system inside the VM. You must manually perform a file system resize within the VM to utilize the newly allocated space.
{% endhint %}

## Resizing a Volume via UI

1. Navigate to the Volumes option in the UI
2. Select the volume that needs to be resized.
3. Select 'extend' from the action bar.
4. A popup will appear displaying available options for volume resize.
5. Choose the desired volume size and click extend volume.

## Resizing a Volume via CLI

It’s possible to increase the size of an attached volume using the following command:

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

```bash
openstack volume set --size <NEW_SIZE_IN_GB> <VOLUME_ID>
```

{% endtab %}
{% endtabs %}

Verify that the volume resize operation has been completed successfully by checking the volume status:

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

```bash
openstack volume show <VOLUME_ID>
```

{% endtab %}
{% endtabs %}

### Live Volume Resize

You can also resize attached (in-use) volumes without detaching them, known as **live volume extend**.

Before performing a live volume resize, ensure the following steps are completed on all hosts:

Install **lsscsi** (if not already installed):

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{% tab title="Bash" %}

```bash
sudo apt install -y lsscsi
```

{% endtab %}
{% endtabs %}

Restart the `pf9-hostagent` service:

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{% tab title="Bash" %}

```bash
systemctl restart pf9-ostackhost
```

{% endtab %}
{% endtabs %}

Once the `pf9-hostagent` service is restarted you can use the `openstack` CLI with the `--os-volume-api-version 3.42` (required) to resize the attached volume.

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

```bash
openstack --os-volume-api-version 3.42 volume set --size <NEW_SIZE_IN_GB> <VOLUME_ID>
```

{% endtab %}
{% endtabs %}

Replace `<new_size_in_GB>` and `<volume_id>` with the desired size and the volume ID:

Verify that the volume resize operation has been completed successfully by checking the volume status:

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

```bash
openstack volume show <VOLUME_ID>
```

{% endtab %}
{% endtabs %}

{% hint style="danger" %}
**Important**

Resizing the volume does not automatically extend the file system inside the VM. You must manually perform a file system resize within the VM to utilize the newly allocated space.
{% endhint %}

## Log Files

See [Log Files](https://docs.platform9.com/private-cloud-director/2025.10/virtualized-clusters/host#log-files) for locations of important log files, including the storage service logs.