> ## Documentation Index
> Fetch the complete documentation index at: https://docs.siderolabs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Existing Volumes

> Configuring existing volumes to mount migrated or pre-existing partitions and disks.

Existing volumes allow mounting pre-existing partitions or disks that are already formatted and contain data.
This is useful for migrating data from another system or reusing existing disks without reformatting them.

Existing volumes match a partition or a disk using a [volume selector](https://docs.siderolabs.com/talos/v1.15/configure-your-talos-cluster/storage-and-disk-management/disk-management/common.md#volume-selector) expression.

Existing volumes are mounted under `/var/mnt/<volume-name>`, and this location gets automatically propagated into the `kubelet` container to provide additional features like `subPath` mounts.

> Note: If you need to allocate a volume to be mounted to a container, please see [User Volumes](https://docs.siderolabs.com/talos/v1.15/configure-your-talos-cluster/storage-and-disk-management/disk-management/user.md) guide.

### Declaring existing volumes

To declare an existing volume, append the following [document](https://docs.siderolabs.com/talos/v1.15/reference/configuration/block/existingvolumeconfig.md) to the machine configuration:

```yaml theme={null}
# existing-volume.patch.yaml
apiVersion: v1alpha1
kind: ExistingVolumeConfig
name: my-data-volume
discovery:
    volumeSelector:
        match: volume.partition_label == "MY-DATA"

```

For example, this machine configuration patch can be applied using the following command:

```bash theme={null}
talosctl --nodes <NODE> patch mc --patch raw-volume.patch.yaml
```

In this example, a existing partition with partition label `MY-DATA` will be mounted as under `/var/mnt/my-data-volume`.

The status of the volume can be checked using the following command:

```bash theme={null}
$ talosctl get volumestatus e-my-data-volume # note e- prefix
NODE         NAMESPACE   TYPE           ID                VERSION   TYPE        PHASE   LOCATION    SIZE
172.20.0.5   runtime     VolumeStatus   e-my-data-volume  1         partition   ready   /dev/sda1   2.0 GB
```

If the volume is no longer needed, it can be removed by deleting the `ExistingVolumeConfig` document from the machine configuration.
Talos will automatically unmount the volume, but it will not try to wipe the underlying data.


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