> ## Documentation Index > Fetch the complete documentation index at: https://docs.rafftechnologies.com/llms.txt > Use this file to discover all available pages before exploring further. # Resize VM Disk > Increase the primary disk of a virtual machine. The VM must be stopped. Disk size can only be increased. ## Billing For subscription VMs, the storage cost difference is calculated pro-rata and deducted from credits, then account balance. Returns `402` if insufficient balance. Updated May 8, 2026 ## OpenAPI ````yaml POST /api/v1/vms/{id}/disk/resize openapi: 3.0.3 info: title: Raff API description: > REST API for managing cloud infrastructure on Raff. ## Authentication Most endpoints require authentication via API key. Catalog endpoints under `/api/v1/public/` are open and require no authentication. ### API Key Authentication Include your API key in the `X-API-Key` header: ``` curl -H "X-API-Key: YOUR_API_KEY" https://api.rafftechnologies.com/api/v1/vms ``` ## Catalog Use the public catalog endpoints to discover available regions, OS templates, and pricing plans before creating resources: - `GET /api/v1/public/regions` — list available regions - `GET /api/v1/public/templates` — list OS templates (use the `id` as `template_id` when creating a VM) - `GET /api/v1/public/pricing/vm` — list VM pricing plans (use the `id` as `pricing_id` when creating a VM) - `GET /api/v1/public/pricing/volume` — volume storage pricing - `GET /api/v1/public/pricing/snapshot` — snapshot storage pricing - `GET /api/v1/public/pricing/backup` — backup storage pricing - `GET /api/v1/public/pricing/ip` — IP address pricing version: 1.0.0 contact: name: Raff Technologies url: https://rafftechnologies.com servers: - url: https://api.rafftechnologies.com description: Production security: - ApiKeyAuth: [] tags: - name: Catalog description: >- Discover available regions, OS templates, and pricing plans. No authentication required. - name: Health description: Health check endpoints - name: Projects description: Organize resources into projects for billing and access control - name: Virtual Machines description: Create, manage, and control virtual machines - name: Networking description: >- Attach and detach VPCs, floating IPs, and security groups to VM network interfaces - name: Snapshots description: Point-in-time copies of VMs and volumes for quick rollback or cloning - name: Backups description: Scheduled and on-demand VM backups with restore capability - name: Backup Schedules description: Recurring daily or weekly backup schedules attached to a VM - name: SSH Keys description: Manage account-level SSH keys for VM provisioning - name: Members description: Account-level members — invite, list, update role, remove - name: Project Members description: Members of a specific project — same model as Members but project-scoped - name: Roles description: Custom roles bundling account or project permissions - name: Permissions description: List the catalog of permission strings used by roles - name: API Keys description: Create and manage API keys for programmatic access - name: Invitations description: Create and cancel email-based invitations to join the account or a project paths: /api/v1/vms/{id}/disk/resize: post: tags: - Virtual Machines summary: Resize VM Disk description: | Increase the primary disk of a virtual machine. The VM must be stopped. Disk size can only be increased. ## Billing For subscription VMs, the storage cost difference is calculated pro-rata and deducted from credits, then account balance. Returns `402` if insufficient balance. operationId: resizeVMDisk parameters: - $ref: '#/components/parameters/VMIDPath' - $ref: '#/components/parameters/ProjectIDHeader' requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/ResizeVMDiskRequest' responses: '200': description: VM disk resized content: application/json: schema: $ref: '#/components/schemas/ResizeResponse' '400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '402': $ref: '#/components/responses/InsufficientBalance' '404': $ref: '#/components/responses/NotFound' components: parameters: VMIDPath: name: id in: path required: true description: VM ID (UUID) schema: type: string format: uuid ProjectIDHeader: name: X-Project-ID in: header required: true description: >- Project ID. Required for all mutating operations (create, delete, power actions, resize). schema: type: string format: uuid schemas: ResizeVMDiskRequest: type: object required: - new_size properties: new_size: type: integer minimum: 1 description: New disk size in GB. Must be larger than current size. ResizeResponse: type: object properties: success: type: boolean example: true message: type: string id: type: string description: Resource ID. billing: $ref: '#/components/schemas/ResizeBillingDetails' ResizeBillingDetails: type: object description: Present only for subscription-based resources. properties: type: type: string enum: - upgrade - downgrade - none pro_rata_amount: type: number description: Amount charged (positive) or credited (negative). credits_applied: type: number balance_applied: type: number new_monthly_price: type: number new_price_per_hour: type: string Error: type: object properties: error: type: string message: type: string responses: BadRequest: description: Invalid request parameters content: application/json: schema: $ref: '#/components/schemas/Error' Unauthorized: description: Authentication required content: application/json: schema: $ref: '#/components/schemas/Error' InsufficientBalance: description: > Account balance is insufficient for this operation. Top up the balance and retry. content: application/json: schema: $ref: '#/components/schemas/Error' example: error: Payment Required message: Insufficient balance for subscription NotFound: description: Resource not found content: application/json: schema: $ref: '#/components/schemas/Error' securitySchemes: ApiKeyAuth: type: apiKey in: header name: X-API-Key description: API key for authentication. Each key is bound to a specific account. ````