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‎articles/cloud-services-extended-support/feature-support-analysis.md

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---
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title: Feature Analysis Cloud Services vs Virtual Machine Scale Sets
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description: Learn about the feature set available in Cloud Services and Virtual Machine Scale Sets
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ms.topic: article
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ms.service: cloud-services-extended-support
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author: surbhijain
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ms.author: surbhijain
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ms.reviewer: mimckitt
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ms.date: 11/8/2022
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ms.custom:
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---
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# Feature Analysis: Cloud Services (extended support) and Virtual Machine Scale Sets
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This article provides a feature analysis of Cloud Services (extended support) and Virtual Machine Scale Sets. For more information on Virtual Machine Scale Sets, please visit the documentation [here](https://learn.microsoft.com/azure/virtual-machine-scale-sets/overview)
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## Basic setup
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| Feature | CSES | Virtual Machine Scale Sets (Flex) | Virtual Machine Scale Sets (Uniform) |
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|---|---|---|---|
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|Virtual machine type|Basic Azure PaaS VM (Microsoft.compute/cloudServices)|Standard Azure IaaS VM (Microsoft.compute/virtualmachines)|Scale Set specific VMs (Microsoft.compute /virtualmachinescalesets/virtualmachines)|
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|Maximum Instance Count (with FD guarantees)|1100|1000|3000 (1000 per Availability Zone)|
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|SKUs supported|D, Dv2, Dv3, Dav4 series, Ev3, Eav4 series, G series, H series|D series, E series, F series, A series, B series, Intel, AMD; Specialty SKUs (G, H, L, M, N) are not supported|All SKUs|
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|Full control over VM, NICs, Disks|Limited control over NICs and VM via CS-ES APIs. No support for Disks|Yes|Limited control with virtual machine scale sets VM API|
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|RBAC Permissions Required|Compute Virtual Machine Scale Sets Write, Compute VM Write, Network|Compute Virtual Machine Scale Sets Write, Compute VM Write, Network|Compute Virtual Machine Scale Sets Write|
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|Accelerated networking|Yes|Yes|Yes|
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|Spot instances and pricing|No|Yes, you can have both Spot and Regular priority instances|Yes, instances must either be all Spot or all Regular|
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|Mix operating systems|Extremely limited Windows support|Yes, Linux and Windows can reside in the same Flexible scale set|No, instances are the same operating system|
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|Disk Types|No Disk Support|Managed disks only, all storage types|Managed and unmanaged disks, All Storage Types
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|Disk Server Side Encryption with Customer Managed Keys|No|Yes| |
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|Write Accelerator|No|No|Yes|
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|Proximity Placement Groups|No|Yes, read Proximity Placement Groups documentation|Yes|
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|Azure Dedicated Hosts|No|No|Yes|
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|Managed Identity|No|User Assigned Identity Only|System Assigned or User Assigned|
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|Azure Instance Metadata Service|No|Yes|Yes|
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|Add/remove existing VM to the group|No|No|No|
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|Service Fabric|No|No|Yes|
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|Azure Kubernetes Service (AKS) / AKE|No|No|Yes|
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|UserData|No|Yes|Yes|
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## Autoscaling and instance orchestration
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| Feature | Cloud Services (extended Support) | Virtual Machine Scale Sets (Flex) | Virtual Machine Scale Sets (Uniform) |
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|---|---|---|---|
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|List VMs in Set|No|Yes|Yes|
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|Automatic Scaling (manual, metrics based, schedule based)|Yes|Yes|Yes|
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|Auto-Remove NICs and Disks when deleting VM instances|Yes|Yes|Yes|
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|Upgrade Policy (VM scale sets)|AutoUD and ManualUD policies. No support for Rolling. Cloud Services - Create Or Update - REST API (Azure Compute) | Microsoft Learn|No, upgrade policy must be null or [] during create|Automatic, Rolling, Manual|
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|Automatic OS Updates|Yes|No|Yes|
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|Customer Defined OS Images|No|Yes|Yes|
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|In Guest Security Patching|No|Yes|No|
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|Terminate Notifications (VM scale sets)|No|Yes, read Terminate Notifications documentation|Yes|
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|Monitor Application Health|No|Application health extension|Application health extension or Azure Load balancer probe|
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|Instance Repair (VM scale sets)|No|Yes, read Instance Repair documentation|Yes|
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|Instance Protection|No|No, use Azure resource lock|Yes|
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|Scale In Policy|No|No|Yes|
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|Get Instance View|Yes|No|Yes|
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|VM Batch Operations (Start all, Stop all, delete subset, etc.)|Yes|Partial, Batch delete is supported. Other operations can be triggered on each instance using VM API)|Yes|
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## High availability
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| Feature | Cloud Services (extended Support) | Virtual Machine Scale Sets (Flex) | Virtual Machine Scale Sets (Uniform) |
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|---|---|---|---|
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|Availability SLA|[SLA](https://azure.microsoft.com/support/legal/sla/cloud-services/v1_5/)|[SLA](https://azure.microsoft.com/support/legal/sla/virtual-machine-scale-sets/v1_1/)|[SLA](https://azure.microsoft.com/support/legal/sla/virtual-machine-scale-sets/v1_1/)|
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|Availability Zones|No|Specify instances land across 1, 2 or 3 availability zones|Specify instances land across 1, 2 or 3 availability zones|
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|Assign VM to a Specific Availability Zone|No|Yes|No|
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|Fault Domain – Max Spreading (Azure will maximally spread instances)|Yes|Yes|Yes|
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|Fault Domain – Fixed Spreading|5 update domains|2-3 FDs (depending on regional maximum FD Count); 1 for zonal deployments|2, 3 5 FDs 1, 5 for zonal deployments|
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|Assign VM to a Specific Fault Domain|No|Yes|No|
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|Update Domains|Yes|Depreciated (platform maintenance performed FD by FD)|5 update domains|
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|Perform Maintenance|No|Trigger maintenance on each instance using VM API|Yes|
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|VM Deallocation|No|Yes|Yes|
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## Networking
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| Feature | Cloud Services (extended Support) | Virtual Machine Scale Sets (Flex) | Virtual Machine Scale Sets (Uniform) |
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|---|---|---|---|
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|Default outbound connectivity|Yes|No, must have explicit outbound connectivity|Yes|
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|Azure Load Balancer Standard SKU|No|Yes|Yes|
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|Application Gateway|No|Yes|Yes|
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|Infiniband Networking|No|No|Yes, single placement group only|
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|Azure Load Balancer Basic SKU|Yes|No|Yes|
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|Network Port Forwarding|Yes (NAT Pool for role instance input endpoints)|Yes (NAT Rules for individual instances)|Yes (NAT Pool)|
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|Edge Sites|No|Yes|Yes|
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|Ipv6 Support|No|Yes|Yes|
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|Internal Load Balancer|No |Yes|Yes|
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## Backup and recovery
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| Feature | Cloud Services (extended Support) | Virtual Machine Scale Sets (Flex) | Virtual Machine Scale Sets (Uniform) |
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|---|---|---|---|
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|Azure Backup|No |Yes|No|
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|Azure Site Recovery|No|Yes (via PowerShell)|No|
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|Azure Alerts|Yes|Yes|Yes|
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|VM Insights|No|Can be installed into individual VMs|Yes|
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## Next steps
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- View the [deployment prerequisites](deploy-prerequisite.md) for Cloud Services (extended support).
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- View [frequently asked questions](faq.yml) for Cloud Services (extended support).

‎articles/cloud-services-extended-support/toc.yml

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href: schema-cscfg-role.md
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- name: NetworkConfiguration schema
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href: schema-cscfg-networkconfiguration.md
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- name: How To
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- name: Migration
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items:
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- name: Migrate to Azure Cloud Services (extended support)
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href: post-migration-changes.md
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- name: Common errors and known issues
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href: in-place-migration-common-errors.md
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- name: Feature Support for CSES
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href: feature-support-analysis.md
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- name: How To
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items:
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- name: Apply extensions
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- name: Apply Remote Desktop extension

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