Offers flexibility to choose specific vCPU/RAM ratios.
Azure limits the number of NICs based on the VM size. If your design requires separate management, sync, and multiple traffic interfaces, you must select an instance size that supports at least 4 NICs. FortiGate VM on Microsoft Azure Data Sheet - Fortinet
Raw firewall throughput numbers published in datasheets reflect ideal traffic conditions (HTTP with large packet sizes). Real-world sizing must account for the inspection tier:
Sizing a FortiGate VM in Azure is equal parts art and science. The safe starting point for any production workload today (2025) is: fortigate vm sizing azure
Accelerated Networking is a non-negotiable requirement for production FortiGate deployments. It utilizes Single Root I/O Virtualization (SR-IOV) to bypass the Azure virtual switch, connecting the VM directly to the physical network interface card (NIC).
user wants a comprehensive article about FortiGate VM sizing in Azure. This requires technical details on supported instance types, sizing guidelines, performance metrics, licensing models, high availability architectures, scaling considerations, and cost optimization. To gather this information, I need to execute a set of searches. search results have provided a variety of sources. The official Fortinet documentation on instance type support, HA, autoscaling, and licensing is crucial. The community discussions and third-party guides offer practical insights. The results on VPN performance and cost optimization are also relevant. To gather detailed information, I need to open multiple key pages. opened pages provide a wealth of information. I will now structure the article. I need to cover introduction, instance types, sizing guidelines, licensing, HA, autoscaling, performance, cost optimization, and a conclusion. I will cite the relevant sources. a secure network in Azure starts with getting your FortiGate VM sizing right. Oversizing leads to unnecessary costs for both the VM and its software license, while undersizing can choke network traffic and create a frustrating user experience. This guide provides a comprehensive framework for making an informed choice, from selecting the right Azure VM instance to scaling for demanding production workloads.
FortiGate VMs write logs, alert databases, and wan-optimization caches to virtual disks. If your logging topology dictates sending traffic logs to local disk storage before forwarding to a FortiAnalyzer or SIEM, you must size the OS and data disks appropriately. Offers flexibility to choose specific vCPU/RAM ratios
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Use or Ultra Disks to prevent disk I/O bottlenecks. Slow disk write times can cause backpressure on the logging daemon, leading to elevated system memory utilization and triggering FortiOS "Conserve Mode." 6. Verification and Monitoring Strategy
Sizing a FortiGate VM (FortiGate-VM) in Azure requires balancing security requirements with infrastructure costs. Under-sizing leads to packet drop, high latency, and application downtime. Over-sizing creates unnecessary cloud expenditure. This guide delivers a technical framework to correctly size, deploy, and optimize FortiGate VMs within Microsoft Azure. 1. The Core Architecture: FortiGate-VM on Azure FortiGate VM on Microsoft Azure Data Sheet -
Standard_D8s_v5 or Standard_F8s_v2 (8 vCPUs, 16-32 GB RAM, Max 8 NICs). Matching Traffic Profiles to FortiOS Inspection Modes
FortiGate for Azure comes in two primary licensing models: from the Azure Marketplace and Bring Your Own License (BYOL) . Each model offers different VM sizes, and Fortinet maps these to specific Azure instance types.
Azure imposes regional vCPU quotas on your subscription. If you plan to deploy multiple large FortiGate-VM instances, verify your quota before deployment. You can request increases from Microsoft if necessary.
