> ## Documentation Index > Fetch the complete documentation index at: https://api-docs.sevalla.com/llms.txt > Use this file to discover all available pages before exploring further. > ## Agent Instructions > This is the Sevalla REST API reference. Base URL: https://api.sevalla.com/v3. Authenticate with an API key in the Authorization header as a Bearer token. > The OpenAPI spec is at https://api.sevalla.com/v3/openapi.json. Concepts and dashboard guides are at https://docs.sevalla.com (index: https://docs.sevalla.com/llms.txt). > To act on a Sevalla account from an AI agent, prefer the Sevalla MCP server (https://mcp.sevalla.com/mcp, see https://docs.sevalla.com/ai-agents/overview.md) or the Sevalla CLI (https://api-docs.sevalla.com/v3/cli.md). # Attach or update process disk > Attach a persistent disk to a web or worker process, or change the size or mount path of its disk. A disk can grow but cannot shrink. A disk can only be mounted by one instance, so if the process uses more than one instance or horizontal scaling, it is switched to manual scaling with one instance. The change takes effect on the next deployment, and the disk is billed while it exists. ## OpenAPI ````yaml https://api.sevalla.com/v3/openapi.json put /applications/{id}/processes/{process_id}/disk openapi: 3.1.0 info: title: Sevalla API docs version: 1.0.0 servers: - url: https://api.sevalla.com/v3 security: - bearerAuth: [] paths: /applications/{id}/processes/{process_id}/disk: put: tags: - Applications summary: Attach or update process disk description: >- Attach a persistent disk to a web or worker process, or change the size or mount path of its disk. A disk can grow but cannot shrink. A disk can only be mounted by one instance, so if the process uses more than one instance or horizontal scaling, it is switched to manual scaling with one instance. The change takes effect on the next deployment, and the disk is billed while it exists. operationId: updateProcessDiskV3 parameters: - schema: example: fb5e5168-4281-4bec-94c5-0d1584e9e657 type: string format: uuid pattern: >- ^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$ in: path name: id required: true description: Application identifier - schema: example: fb5e5168-4281-4bec-94c5-0d1584e9e657 type: string format: uuid pattern: >- ^([0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[1-8][0-9a-fA-F]{3}-[89abAB][0-9a-fA-F]{3}-[0-9a-fA-F]{12}|00000000-0000-0000-0000-000000000000|ffffffff-ffff-ffff-ffff-ffffffffffff)$ in: path name: process_id required: true description: Process identifier requestBody: required: true content: application/json: schema: type: object properties: resource_type_id: type: string minLength: 1 description: >- Identifier of the disk resource type, which sets the disk size. Use the List Disk Resource Types endpoint to retrieve available options. A disk can grow but cannot shrink. example: fb5e5168-4281-4bec-94c5-0d1584e9e657 mount_path: type: string description: >- Path inside the container where the disk is mounted. Only letters, numbers, `-`, `_`, `.` and `/` are allowed, and `/etc`, `/var`, `/lib`, `/usr/local`, `/mnt`, `/root`, `/app`, `/workspace` and `/layers` themselves cannot be used. example: /var/lib/data required: - resource_type_id - mount_path responses: '200': description: >- Persistent disk attached to the process, which keeps its data across deployments and restarts. null when the process has no disk. content: application/json: schema: anyOf: - type: object properties: resource_type_id: type: string description: Unique identifier for the disk resource type example: fb5e5168-4281-4bec-94c5-0d1584e9e657 resource_type_name: type: string description: Name of the disk resource type (disk size) example: ps1 size_gib: type: integer minimum: 1 maximum: 9007199254740991 description: Disk size in GiB example: 10 mount_path: anyOf: - type: string - type: 'null' description: Path inside the container where the disk is mounted example: /var/lib/data required: - resource_type_id - resource_type_name - size_gib - mount_path additionalProperties: false - type: 'null' description: >- Persistent disk attached to the process, which keeps its data across deployments and restarts. null when the process has no disk. '400': description: Default Response content: application/json: schema: type: object properties: message: type: string description: Error message example: Bad request status: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: HTTP status code example: 400 data: type: object properties: code: description: Error tracking code for support reference example: err-abc-123 type: string message: description: Additional error details or instructions example: >- If you need assistance, please contact support and provide this error code. type: string additionalProperties: false required: - message - status additionalProperties: false '401': description: Default Response content: application/json: schema: type: object properties: message: type: string description: Error message example: Unauthorized status: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: HTTP status code example: 401 data: type: object properties: code: description: Error tracking code for support reference example: err-abc-123 type: string message: description: Additional error details or instructions example: >- If you need assistance, please contact support and provide this error code. type: string additionalProperties: false required: - message - status additionalProperties: false '403': description: Default Response content: application/json: schema: type: object properties: message: type: string description: Error message example: >- This API key is missing the : permission. Grant it to the key or use a key that has it. status: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: HTTP status code example: 403 data: type: object properties: code: description: Error tracking code for support reference example: err-abc-123 type: string message: description: Additional error details or instructions example: >- If you need assistance, please contact support and provide this error code. type: string additionalProperties: false required: - message - status additionalProperties: false '404': description: Default Response content: application/json: schema: type: object properties: message: type: string description: Error message example: Not found status: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: HTTP status code example: 404 data: type: object properties: code: description: Error tracking code for support reference example: err-abc-123 type: string message: description: Additional error details or instructions example: >- If you need assistance, please contact support and provide this error code. type: string additionalProperties: false required: - message - status additionalProperties: false '429': description: Default Response content: application/json: schema: type: object properties: message: type: string description: Error message example: Too many requests status: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: HTTP status code example: 429 data: type: object properties: code: description: Error tracking code for support reference example: err-abc-123 type: string message: description: Additional error details or instructions example: >- If you need assistance, please contact support and provide this error code. type: string additionalProperties: false required: - message - status additionalProperties: false '500': description: Default Response content: application/json: schema: type: object properties: message: type: string description: Error message example: Internal Server Error status: type: integer minimum: -9007199254740991 maximum: 9007199254740991 description: HTTP status code example: 500 data: type: object properties: code: description: Error tracking code for support reference example: err-abc-123 type: string message: description: Additional error details or instructions example: >- If you need assistance, please contact support and provide this error code. type: string additionalProperties: false required: - message - status additionalProperties: false components: securitySchemes: bearerAuth: type: http scheme: bearer description: >- API key authentication. Pass your API key as a Bearer token in the Authorization header. ```` This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.