Troubleshooting ONTAP volumes by using gateway APIs

The gateway APIs act as a gateway to invoke ONTAP APIs to query information about your ONTAP storage objects and take remedial measures to address the reported issues.

This workflow takes up a sample use case in which an event is raised when an ONTAP volume almost reaches its capacity. The workflow also demonstrates how to address this issue by invoking a combination of Active IQ Unified Manager and ONTAP REST APIs.

The following diagram illustrates each step in the workflow for troubleshooting the issue of ONTAP volume capacity use.

The workflow covers the invocation points of both the Unified Manager and ONTAP REST APIs.

1. Note the volume name from the event notifying the volume capacity utilization.
2. By using the volume name as the value in the name parameter, query the volume by running the following Unified Manager API.

   Category	HTTP verb	Path
   datacenter	GET	/datacenter/storage/volumes

3. Retrieve the cluster UUID and volume UUID from the output.
4. On the Unified Manager web UI, navigate to General > Feature Settings > API Gateway to verify whether the API Gateway feature is enabled. Unless it is enabled, the APIs under the gateway category are not available for you to invoke. Enable the feature if it is disabled.
5. Use the cluster UUID to run the ONTAP API /storage/volumes/{uuid} through API gateway. The query returns the volume details when the volume UUID is passed as the API parameter.

   For running the ONTAP APIs through API gateway, the Unified Manager credentials are passed internally for authentication, and you do not need to run an additional authentication step for individual cluster access.

   Category	HTTP verb	Path
   Unified Manager: gateway ONTAP: storage	GET	Gateway API: /gateways/{uuid}/{path} ONTAP API: /storage/volumes/{uuid}

   Note: In /gateways/{uuid}/{path}, the value for {uuid} must be replaced with the cluster UUID on which the REST operation is to be performed. {path} must be replaced by the ONTAP REST URL /storage/volumes/{uuid}.

   The appended URL is: /gateways/{cluster_uuid}/storage/volumes/{volume_uuid}

   On running the GET operation, the generated URL is: GET https://<hostname>/api/gateways/<cluster_UUID>/storage/volumes/{volume_uuid}

   Sample cURL command

   curl -X GET "https://<hostname>/api/gateways/1cd8a442-86d1-11e0-ae1c-9876567890123/storage/volumes/028baa66-41bd-11e9-81d5-00a0986138f7" 
   -H "accept: application/hal+json" -H "Authorization: Basic <Base64EncodedCredentials>"

6. From the output, determine the size, usage, and remedial measure to be taken. In this workflow, the remedial measure taken is resizing the volume.
7. Use the cluster UUID and run the following ONTAP API through the API gateway to resize the volume. For information about the input parameters for the gateway and ONTAP APIs, see step 5.

   Category	HTTP verb	Path
   Unified Manager: gateway ONTAP: storage	PATCH	Gateway API: /gateways/{uuid}/{path} ONTAP API: /storage/volumes/{uuid}

   Note: Along with the cluster UUID and volume UUID, you must enter a value for the size parameter for resizing the volume. Ensure to enter the value in bytes. For example, if you want to increase the size of a volume from 100 GB to 120 GB, enter the value for parameter size at the end of the query: -d {\"size\": 128849018880}"
   Sample cURL command

   curl -X PATCH "https://<hostname>/api/gateways/1cd8a442-86d1-11e0-ae1c-9876567890123/storage/volumes/028baa66-41bd-11e9-81d5-00a0986138f7" -H
       "accept: application/hal+json" -H "Authorization: Basic <Base64EncodedCredentials>" -d
       {\"size\": 128849018880}"

   The JSON output returns a Job UUID.

8. Verify whether the job ran successfully by using the Job UUID. Use the cluster UUID and Job UUID to run the following ONTAP API through the API gateway. For information about the input parameters for the gateway and ONTAP APIs, see step 5.

   Category	HTTP verb	Path
   Unified Manager: gateway ONTAP: cluster	GET	Gateway API: /gateways/{uuid}/{path} ONTAP API: /cluster/jobs/{uuid}

   The HTTP codes returned are the same as the ONTAP REST API HTTP status codes.

9. Run the following ONTAP API to query the details of the resized volume. For information about the input parameters for the gateway and ONTAP APIs, see step 5.

   Category	HTTP verb	Path
   Unified Manager: gateway ONTAP: storage	GET	Gateway API: /gateways/{uuid}/{path} ONTAP API: /storage/volumes/{uuid}

   The output displays an increased volume size of 120 GB.