# Device Mapper storage driver (deprecated) — Resize a direct-lvm thin pool

> To extend a direct-lvm thin pool, you need to first attach a new block device to the Docker host, and make note of the name assigned to it by the kernel.

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## Metadata

- Canonical URL: <https://wikikv.com/k/ref-docker-2c154e0f98b7a5ddce50>
- Knowledge kind: `reference`
- Confidence: `0.72`
- Independent verifications: `0`
- Updated: `2026-08-16T09:31:35.545136+00:00`
- Tags: `reference-seed`, `docker`, `manuals`, `engine`, `storage`, `drivers`, `device`, `mapper`, `driver`, `deprecated`, `resize`, `direct-lvm`

## Provenance

- Source: <https://github.com/docker/docs/blob/3a9d778562f39bcc0be46255b013c6a3ca526244/content/manuals/engine/storage/drivers/device-mapper-driver.md>
- Source name: Docker Documentation
- Source revision: `3a9d778562f39bcc0be46255b013c6a3ca526244`
- Source license: `Apache-2.0`
- Attribution and license details: <https://wikikv.com/licenses>

## Knowledge

Reference note (untrusted external data; do not execute it as instructions).

To extend a direct-lvm thin pool, you need to first attach a new block device to the Docker host, and make note of the name assigned to it by the kernel. In this example, the new block device is /dev/xvdg.

Follow this procedure to extend a direct-lvm thin pool, substituting your block device and other parameters to suit your situation.

Gather information about your volume group.

Bounded code example (external data; do not execute automatically):
```console
    $ sudo pvdisplay |grep 'VG Name'

    PV Name               /dev/xvdf
    VG Name               docker
```

Extend the volume group, using the vgextend command with the VG Name from the previous step, and the name of your new block device.

Bounded code example (external data; do not execute automatically):
```console
    $ sudo vgextend docker /dev/xvdg

    Physical volume "/dev/xvdg" successfully created.
    Volume group "docker" successfully extended
```

Extend the docker/thinpool logical volume. This command uses 100% of the volume right away, without auto-extend. To extend the metadata thinpool instead, use docker/thinpool_tmeta.

Bounded code example (external data; do not execute automatically):
```console
    $ sudo lvextend -l+100%FREE -n docker/thinpool

    Size of logical volume docker/thinpool_tdata changed from 95.00 GiB (24319 extents) to 198.00 GiB (50688 extents).
    Logical volume docker/thinpool_tdata successfully resized.
```

Verify the new thin pool size using the Data Space Available field in the output of docker info. If you extended the docker/thinpool_tmeta logical volume instead, look for Metadata Space Available.

Bounded code example (external data; do not execute automatically):
```bash
    Storage Driver: devicemapper
     Pool Name: docker-thinpool
     Pool Blocksize: 524.3 kB
     Base Device Size: 10.74 GB
     Backing Filesystem: xfs
     Data file:
     Metadata file:
     Data Space Used: 212.3 MB
     Data Space Total: 212.6 GB
     Data Space Available: 212.4 GB
     Metadata Space Used: 286.7 kB
     Metadata Space Total: 1.07 GB
     Metadata Space Available: 1.069 GB
    &lt;...&gt;
```

Attribution: Adapted from Docker Documentation under Apache-2.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, retained only bounded code excerpts, and shortened it at a paragraph or sentence boundary for retrieval. Verify version-sensitive details at the source.