> ## Documentation Index
> Fetch the complete documentation index at: https://vastai-80aa3a82-auto-openapi-update-8483c1e9.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Copy Volume

> Clones an existing volume (src_id) into a new volume provisioned from a destination ask (dst_id), optionally resizing.



## OpenAPI

````yaml /api-reference/openapi.yaml post /api/v0/volumes/copy/
openapi: 3.1.0
info:
  title: Vast.ai API
  description: >-
    Vast.ai REST API for managing GPU cloud instances, machine operations, and
    AI/ML workflows.


    ## AI Agent Quick-Start


    Install the CLI skill for your agent (Claude Code, Cursor, Windsurf, etc.):
      npx skills add vast-ai/vast-cli

    CLI reference:
    https://raw.githubusercontent.com/vast-ai/vast-cli/master/vastai/SKILL.md

    SDK reference:
    https://raw.githubusercontent.com/vast-ai/vast-cli/master/vastai_sdk/SKILL.md


    ## Auth

    All endpoints require `Authorization: Bearer $VAST_API_KEY`.

    Get your key at: https://cloud.vast.ai/manage-keys/


    ## Key Quirks

    - `gpu_ram` in CLI = GB; in REST API = MB (CLI auto-converts)

    - SSH keys must be registered BEFORE creating an instance (VM: no recovery;
    Docker: can add post-create)

    - `onstart` field is limited to 4048 characters -- gzip+base64 for longer
    scripts

    - `POST /api/v0/asks/{id}/` (create instance) returns `new_contract` as the
    instance ID, not `id`

    - Poll trap: if `actual_status` becomes `exited`, `unknown`, or `offline` it
    will never reach `running` -- destroy and retry
  version: 1.0.0
  contact:
    name: Vast.ai Support
    url: https://discord.gg/vast
servers:
  - url: https://console.vast.ai
    description: Production server
security:
  - BearerAuth: []
paths:
  /api/v0/volumes/copy/:
    post:
      tags:
        - Volumes
      summary: Copy Volume
      description: >-
        Clones an existing volume (src_id) into a new volume provisioned from a
        destination ask (dst_id), optionally resizing.
      responses:
        '200':
          description: >-
            Successful response from volume creation with copy operation (shape
            determined by create_volume helper)
          content:
            application/json:
              schema:
                type: object
                properties:
                  success:
                    type: boolean
                    description: true on success.
                  volume_name:
                    type: string
                    description: >-
                      Identifier of the newly created destination volume (e.g.
                      "V.67890").
                required:
                  - success
                  - volume_name
              example:
                success: true
                volume_name: V.67890
        '400':
          description: >-
            Missing src_id/dst_id, or requested size is smaller than source
            volume; error: "invalid_args"
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: >-
            Source volume not found or not owned by caller; error:
            "unauthorized", msg: "Unauthorized to access volume {id}, or it does
            not exist"
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '500':
          description: >-
            Internal error retrieving source disk contract or machine, or volume
            creation failed; msg: "error 500: Please contact vast.ai support"
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
      security:
        - BearerAuth: []
components:
  schemas:
    Error:
      type: object
      properties:
        error:
          type: string
        msg:
          type: string
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: API key must be provided in the Authorization header

````