A customer is using NetApp ONTAP software and wants to tier data from ONTAP clusters with all-SSD aggregates or all-HDD aggregates to the Microsoft…

To optimize data tiering performance from an on-premises ONTAP cluster to Microsoft Azure, establishing a robust and direct network path is crucial. An Azure ExpressRoute connection (B) provides a private, dedicated, high-bandwidth, and low-latency link, bypassing the public internet. This ensures consistent and predictable network performance for large-scale data transfers.

Once the traffic reaches Azure, a VNet service endpoint to Azure Storage (A) secures and optimizes the route. It ensures that traffic from the virtual network to the Azure Blob storage account travels exclusively over the Microsoft Azure backbone network, avoiding public internet hops and potential network congestion, which further enhances performance and security.

C. Choose the IPspace with which each LIF is associated.

This is a fundamental network configuration step for connectivity and traffic segmentation in ONTAP, not a specific practice to enhance cloud tiering performance.

D. Create an HTTPS connection over port 443 to BlueXP tiering.

This connection is for management and orchestration (control plane) via BlueXP. The actual data transfer (data plane) occurs directly from the ONTAP cluster to Azure Blob, so this does not impact data tiering performance.

1. NetApp BlueXP Documentation, "Tiering on-premises ONTAP data to Azure Blob storage": In the "Networking requirements for tiering to Azure" section, the documentation explicitly states the need for "A VPN or Azure ExpressRoute connection from your on-prem network to the Azure VNet" and recommends "A service endpoint from the subnet to the Microsoft.Storage service... so that traffic between the cluster and the object store stays within the Azure network." This directly supports options A and B as requirements and best practices for performance and security.

(Source: NetApp BlueXP Official Documentation)

2. NetApp Technical Report 4598, "FabricPool Best Practices": Section 3.1, "Networking," states, "For best performance and security, NetApp recommends using a private, dedicated connection to the cloud, such as AWS Direct Connect or Azure ExpressRoute." It further recommends using a private or service endpoint for the storage account to ensure traffic travels over the private connection and the Azure backbone, which provides "better security and performance."

(Source: NetApp TR-4598, Page 10, Section 3.1)

3. Microsoft Azure Documentation, "Azure Virtual Network service endpoints": This document explains that service endpoints "provide a direct connection to Azure services over the Azure backbone network. Endpoints allow you to secure your critical Azure service resources to only your virtual networks. Traffic from your VNet to the Azure service always remains on the Microsoft Azure backbone network." This confirms the performance and security benefits of using a service endpoint.

(Source: Microsoft Azure Official Documentation)