Documentation for feature_11038_enhancement_of_vertical_scale_and_merge_in_update_API

sudo nc <dest_vnf_ip_address> 90

# All the packets from src vnf to dest vnf should route only through the mid vnf.

```

## How to perform Vertical Scaling of VNFs in OSM

#### Functionality Overview

- Vertical scaling allows you to dynamically adjust the resource allocation (CPU, memory, storage) of a deployed VNF instance to meet changing demands. This can improve resource utilization and application performance.

#### VNFD Requirements

The VNFD is a critical component for vertical scaling. It must include the following elements:

- software-version: 

  - Vertical scaling often involves changing the VNF software version to accommodate different resource requirements. The VNFD should allow specifying the software version associated with each flavor.

- virtual-compute-desc: 

  - The VNFD should define the VDUs (virtualized components) that make up the VNF. Each VDU should specify the supported flavor options with varying resource configurations (CPU, memory).

- virtual-storage-desc:

  - The VNFD should define the required virtual storage under the aformention key.  

```yaml

  software-version: 2.9

  virtual-compute-desc:

    - id: hackfest_basic-VM-compute

      virtual-cpu:

        num-virtual-cpu: 1

      virtual-memory:

        size: '1'

  virtual-storage-desc:

    - id: hackfest_basic-VM-storage

      size-of-storage: 10

```

#### Vertical Scaling Operations

There are two primary ways to trigger vertical scaling of a VNF instance in OSM.

**Important Note:** Regardless of the chosen method (OSM client or NGUI), ensure the new flavor provides sufficient resources for the VNF to function correctly.

1. OSM Client: 

    - The OSM client provides a command-line interface for various operations, including vertical scaling. You can use the following command to initiate vertical scaling:

      ```yaml

      osm ns-update <NS_NAME> --updateType VERTICAL_SCALE --vnf <MEMBER_VNF_INDEX|VNFINSTANCEID> --vnfd-name <VNFDID|VNFD_NAME> --vdu <VDUID>

      ```

    - Parameters:

      - NS_NAME: Name of the OSM Network Service instance.

      - MEMBER_VNF_INDEX (or VNFINSTANCEID): Identifier of the VNF member within the NS or the VNFD instance ID.

      - VNFDID (or VNFD_NAME): Identifier of the VNFD or its name.

      - VDUID: ID of the specific VDU within the VNFD to be scaled.

2. NGUI (Next Generation User Interface): 

    - If available in your OSM deployment, the NGUI offer's a graphical interface to trigger vertical scaling operations.

    - Navigate to OSM dashboard and click Action button then chose `NS Update` option, this will opn a new window shown below in image.

    - In `NS Update` option provide the inputs and click on apply, this will trigger the Vertical scale opertaion for the selected VNFs vdu. 

 - ![vertical_scale_update](assets/600px_vertical_scale_update.png)

- ![vertical_scale_update2](assets/600px_vertical_scale_update_2.png)

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