> ## 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.

> ExistingVolumeConfig is an existing volume configuration document. Existing volumes allow to mount partitions (or whole disks) that were created outside of Talos. Volume will be mounted under `/var/mnt/<name>`. The existing volume config name should not conflict with user volume names.

# ExistingVolumeConfig

export const VersionWarningBanner = () => {
  const latestVersion = "v1.13";
  const [latestUrl, setLatestUrl] = useState(null);
  const [currentVersion, setCurrentVersion] = useState(null);
  const [isBeta, setIsBeta] = useState(false);
  const parseVersion = v => v.replace("v", "").split(".").map(Number);
  const isGreaterVersion = (a, b) => {
    const [aMajor, aMinor] = parseVersion(a);
    const [bMajor, bMinor] = parseVersion(b);
    if (aMajor > bMajor) return true;
    if (aMajor === bMajor && aMinor > bMinor) return true;
    return false;
  };
  useEffect(() => {
    if (typeof window === "undefined") return;
    const {pathname, hash, search} = window.location;
    const match = pathname.match(/\/talos\/(v\d+\.\d+)\//);
    if (!match) return;
    const detectedVersion = match[1];
    if (detectedVersion === latestVersion) return;
    setCurrentVersion(detectedVersion);
    if (isGreaterVersion(detectedVersion, latestVersion)) {
      setIsBeta(true);
    }
    const newPath = pathname.replace(`/talos/${detectedVersion}/`, `/talos/${latestVersion}/`);
    setLatestUrl(`${newPath}${search}${hash}`);
  }, []);
  if (!latestUrl || !currentVersion) return null;
  return <div className="not-prose sticky top-6 z-50 my-6">
      <div className="border border-yellow-500/30 bg-yellow-500/10 px-4 py-3 rounded-xl">
        <div className="text-sm">
          {isBeta ? <>
              ⚠️ You are viewing a <strong>beta version</strong> of Talos ({currentVersion}).
              This version may be unstable.
              <a href={latestUrl} className="ml-2 underline text-yellow-400 hover:text-yellow-300 font-medium">
                View latest stable version {latestVersion} →
              </a>
            </> : <>
              ⚠️ You are viewing an older version of Talos ({currentVersion}).
              <a href={latestUrl} className="ml-2 underline text-yellow-400 hover:text-yellow-300 font-medium">
                View the latest version {latestVersion} →
              </a>
            </>}
        </div>
      </div>
    </div>;
};

<VersionWarningBanner />

```yaml theme={null}
apiVersion: v1alpha1
kind: ExistingVolumeConfig
name: my-existing-volume # Name of the volume.
# The discovery describes how to find a volume.
discovery:
    # The volume selector expression.
    volumeSelector:
        match: volume.partition_label == "MY-DATA" # The Common Expression Language (CEL) expression to match the volume.
```

<table>
  <thead>
    <tr>
      <th>Field</th>
      <th>Type</th>
      <th>Description</th>
      <th>Value(s)</th>
    </tr>
  </thead>

  <tbody>
    <tr>
      <td>`name`</td>
      <td>string</td>
      <td>Name of the volume.<br /><br />Name can only contain:<br />lowercase and uppercase ASCII letters, digits, and hyphens.</td>

      <td />
    </tr>

    <tr>
      <td>`discovery`</td>
      <td><a href="#discovery">VolumeDiscoverySpec</a></td>
      <td>The discovery describes how to find a volume.</td>

      <td />
    </tr>

    <tr>
      <td>`mount`</td>
      <td><a href="#mount">MountSpec</a></td>
      <td>The mount describes additional mount options.</td>

      <td />
    </tr>
  </tbody>
</table>

## discovery

VolumeDiscoverySpec describes how the volume is discovered.

<table>
  <thead>
    <tr>
      <th>Field</th>
      <th>Type</th>
      <th>Description</th>
      <th>Value(s)</th>
    </tr>
  </thead>

  <tbody>
    <tr>
      <td>`volumeSelector`</td>
      <td><a href="#volumeselector">VolumeSelector</a></td>
      <td>The volume selector expression.</td>

      <td />
    </tr>
  </tbody>
</table>

### volumeSelector

VolumeSelector selects an existing volume.

<table>
  <thead>
    <tr>
      <th>Field</th>
      <th>Type</th>
      <th>Description</th>
      <th>Value(s)</th>
    </tr>
  </thead>

  <tbody>
    <tr>
      <td>`match`</td>
      <td>Expression</td>
      <td>The Common Expression Language (CEL) expression to match the volume.</td>

      <td />
    </tr>
  </tbody>
</table>

## mount

MountSpec describes how the volume is mounted.

<table>
  <thead>
    <tr>
      <th>Field</th>
      <th>Type</th>
      <th>Description</th>
      <th>Value(s)</th>
    </tr>
  </thead>

  <tbody>
    <tr>
      <td>`readOnly`</td>
      <td>bool</td>
      <td>Mount the volume read-only.</td>

      <td />
    </tr>
  </tbody>
</table>