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This article provides a feature analysis of Cloud Services (extended support) and Virtual Machine Scale Sets. For more information on VMSS, please visit the documentation [here](https://learn.microsoft.com/azure/virtual-machine-scale-sets/overview)
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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)
|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 VMSS Write, Compute VM Write, Network|Compute VMSS Write, Compute VM Write, Network|Compute VMSS Write|
|Spot instances and pricingr|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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|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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|Availability SLA|99.95% for instances spread across fault domains|99.95% for instances spread across fault domains; 99.99% for instances spread across multiple zones|99.95 for FD>1 in Single Placement Group 99.99% for instances spread across multiple zones|
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|Availability SLA|[99.95%](https://azure.microsoft.com/support/legal/sla/cloud-services/v1_5/) for instances spread across fault domains|99.95% for instances spread across fault domains; [99.99%](https://azure.microsoft.com/support/legal/sla/virtual-machine-scale-sets/v1_1/) for instances spread across multiple zones|[99.95](https://azure.microsoft.com/support/legal/sla/virtual-machine-scale-sets/v1_1/) for FD>1 in Single Placement Group 99.99% for instances spread across multiple zones|
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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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