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--- title: M size series description: Information on and specifications of the M-series sizes author: mattmcinnes ms.service: azure-virtual-machines ms.subservice: sizes ms.topic: concept-article ms.date: 03/10/2026 ms.author: mattmcinnes ms.reviewer: mattmcinnes # Customer intent: As a cloud architect, I want to assess the specifications of M-series virtual machines, so that I can determine their suitability for deploying large-scale applications and databases that require high vCPU counts and substantial memory. --- # M sizes series [!INCLUDE [m-summary](./includes/m-series-summary.md)] ## Host specifications [!INCLUDE [m-series-specs](./includes/m-series-specs.md)] For features supported by this series, see the [Feature support](#feature-support) section. ## Sizes in series ### [Basics](#tab/sizebasic) vCPUs (Qty.) and Memory for each size | Size Name | vCPUs (Qty.) | Memory (GiB) | | --- | --- | --- | | Standard_M8ms | 8 | 218.75 | | Standard_M16ms | 16 | 437.5 | | Standard_M32ts | 32 | 192 | | Standard_M32ls | 32 | 256 | | Standard_M32ms | 32 | 875 | | Standard_M64s | 64 | 1,024 | | Standard_M64ls | 64 | 512 | | Standard_M64ms | 64 | 1,792 | | Standard_M128s | 128 | 2,048 | | Standard_M128ms | 128 | 3,892 | | Standard_M64 | 64 | 1,024 | | Standard_M64m | 64 | 1,792 | | Standard_M128 | 128 | 2,048 | | Standard_M128m | 128 | 3,892 | #### VM Basics resources - More than 64 vCPU's require one of these supported guest versions: Windows Server 2016, Ubuntu 18.04+ LTS, SLES 12 SP2+, Red Hat Enterprise Linux 7/8/9, CentOS 7.3+ or Oracle Linux 7.3+ with LIS 4.2.1 or higher. - Instance is isolated to hardware dedicated to a single customer. - [Constrained core sizes](/azure/virtual-machines/constrained-vcpu) are available for Standard_M16ms, Standard_M32ms, Standard_M64ms, and Standard_M128ms. - [Check vCPU quotas](../../../virtual-machines/quotas.md) ### [Local Storage](#tab/sizestoragelocal) Local (temp) storage info for each size | Size Name | Max Temp Storage Disks (Qty.) | Temp Disk Size (GiB) | Max Temp Disk Random Read (RR)¹ IOPS | Max Temp Disk Random Read (RR)¹ Throughput (MB/s) | Max Temp Disk Cache Size (GiB) | Max Temp Disk Burst² IOPS | Max Temp Disk Burst² Throughput (MB/s) | | --- | --- | --- | --- | --- | --- | --- | --- | | Standard_M8ms | 1 | 256 | 10,000 | 100 | 793 | 10,000 | 250 | | Standard_M16ms | 1 | 512 | 20,000 | 200 | 1,587 | 20,000 | 500 | | Standard_M32ts | 1 | 1,024 | 40,000 | 400 | 3,174 | 40,000 | 1,000 | | Standard_M32ls | 1 | 1,024 | 40,000 | 400 | 3,174 | 40,000 | 1,000 | | Standard_M32ms | 1 | 1,024 | 40,000 | 400 | 3,174 | 40,000 | 1,000 | | Standard_M64s | 1 | 2,048 | 80,000 | 800 | 6,348 | 80,000 | 2,000 | | Standard_M64ls | 1 | 2,048 | 80,000 | 800 | 6,348 | 80,000 | 2,000 | | Standard_M64ms | 1 | 2,048 | 80,000 | 800 | 6,348 | 80,000 | 2,000 | | Standard_M128s | 1 | 4,096 | 160,000 | 1,600 | 12,696 | 250,000 | 4,000 | | Standard_M128ms | 1 | 4,096 | 160,000 | 1,600 | 12,696 | 250,000 | 4,000 | | Standard_M64 | 1 | 7,168 | 80,000 | 800 | 1,228 | 80,000 | 2,000 | | Standard_M64m | 1 | 7,168 | 80,000 | 800 | 1,228 | 80,000 | 2,000 | | Standard_M128 | 1 | 14,336 | 250,000 | 1,600 | 2456 | 250,000 | 4,000 | | Standard_M128m | 1 | 14,336 | 250,000 | 1,600 | 2456 | 250,000 | 4,000 | #### Storage resources - [Introduction to Azure managed disks](../../../virtual-machines/managed-disks-overview.md) - [Azure managed disk types](../../../virtual-machines/disks-types.md) - [Share an Azure managed disk](../../../virtual-machines/disks-shared.md) #### Table definitions - ¹Temp disk speed often differs between RR (Random Read) and RW (Random Write) operations. RR operations are typically faster than RW operations. The RW speed is usually slower than the RR speed on series where only the RR speed value is listed. - ²Some sizes support [bursting](../../disk-bursting.md) to temporarily increase disk performance. Burst speeds can be maintained for up to 30 minutes at a time. - Storage capacity is shown in units of GiB or 1024^3 bytes. When you compare disks measured in GB (1000^3 bytes) to disks measured in GiB (1024^3) remember that capacity numbers given in GiB may appear smaller. For example, 1023 GiB = 1098.4 GB. - Disk throughput is measured in input/output operations per second (IOPS) and MBps where MBps = 10^6 bytes/sec. - To learn how to get the best storage performance for your VMs, see [Virtual machine and disk performance](../../../virtual-machines/disks-performance.md). ### [Remote Storage](#tab/sizestorageremote) Remote (uncached) storage info for each size | Size Name | Max Remote Storage Disks (Qty.) | Max Uncached Premium SSD IOPS | Max Uncached Premium SSD Throughput (MB/s) | Max Uncached Premium SSD Burst¹ IOPS | Max Uncached Premium SSD Burst¹ Throughput (MB/s) | | --- | --- | --- | --- | --- | --- | | Standard_M8ms | 8 | 5,000 | 125 | 10,000 | 250 | | Standard_M16ms | 16 | 10,000 | 250 | 20,000 | 500 | | Standard_M32ts | 32 | 20,000 | 500 | 40,000 | 1,000 | | Standard_M32ls | 32 | 20,000 | 500 | 40,000 | 1,000 | | Standard_M32ms | 32 | 20,000 | 500 | 40,000 | 1,000 | | Standard_M64s | 64 | 40,000 | 1,000 | 80,000 | 2,000 | | Standard_M64ls | 64 | 40,000 | 1,000 | 80,000 | 2,000 | | Standard_M64ms | 64 | 40,000 | 1,000 | 80,000 | 2,000 | | Standard_M128s | 64 | 80,000 | 2,000 | 80,000 | 4,000 | | Standard_M128ms | 64 | 80,000 | 2,000 | 80,000 | 4,000 | | Standard_M64 | 64 | 40,000 | 1,000 | 80,000 | 2,000 | | Standard_M64m | 64 | 40,000 | 1,000 | 80,000 | 2,000 | | Standard_M128 | 64 | 80,000 | 2,000 | 80,000 | 4,000 | | Standard_M128m | 64 | 80,000 | 2,000 | 80,000 | 4,000 | #### Storage resources - [Introduction to Azure managed disks](../../../virtual-machines/managed-disks-overview.md) - [Azure managed disk types](../../../virtual-machines/disks-types.md) - [Share an Azure managed disk](../../../virtual-machines/disks-shared.md) #### Table definitions - ¹Some sizes support [bursting](../../disk-bursting.md) to temporarily increase disk performance. Burst speeds can be maintained for up to 30 minutes at a time. - Storage capacity is shown in units of GiB or 1024^3 bytes. When you compare disks measured in GB (1000^3 bytes) to disks measured in GiB (1024^3) remember that capacity numbers given in GiB may appear smaller. For example, 1023 GiB = 1098.4 GB. - Disk throughput is measured in input/output operations per second (IOPS) and MBps where MBps = 10^6 bytes/sec. - Data disks can operate in cached or uncached modes. For cached data disk operation, the host cache mode is set to ReadOnly or ReadWrite. For uncached data disk operation, the host cache mode is set to None. - To learn how to get the best storage performance for your VMs, see [Virtual machine and disk performance](../../../virtual-machines/disks-performance.md). ### [Network](#tab/sizenetwork) Network interface info for each size | Size Name | Max NICs (Qty.) | Max Network Bandwidth (Mb/s) | | --- | --- | --- | | Standard_M8ms | 4 | 2,000 | | Standard_M16ms | 8 | 4,000 | | Standard_M32ts | 8 | 8,000 | | Standard_M32ls | 8 | 8,000 | | Standard_M32ms | 8 | 8,000 | | Standard_M64s | 8 | 16,000 | | Standard_M64ls | 8 | 16,000 | | Standard_M64ms | 8 | 16,000 | | Standard_M128s | 8 | 30,000 | | Standard_M128ms | 8 | 30,000 | | Standard_M64 | 8 | 16,000 | | Standard_M64m | 8 | 16,000 | | Standard_M128 | 8 | 32,000 | | Standard_M128m | 8 | 32,000 | #### Networking resources - [Virtual networks and virtual machines in Azure](/azure/virtual-network/network-overview) - [Virtual machine network bandwidth](/azure/virtual-network/virtual-machine-network-throughput) #### Table definitions - Expected network bandwidth is the maximum aggregated bandwidth allocated per VM type across all NICs, for all destinations. For more information, see [Virtual machine network bandwidth](/azure/virtual-network/virtual-machine-network-throughput) - Upper limits aren't guaranteed. Limits offer guidance for selecting the right VM type for the intended application. Actual network performance will depend on several factors including network congestion, application loads, and network settings. For information on optimizing network throughput, see [Optimize network throughput for Azure virtual machines](/azure/virtual-network/virtual-network-optimize-network-bandwidth). - To achieve the expected network performance on Linux or Windows, you may need to select a specific version or optimize your VM. For more information, see [Bandwidth/Throughput testing (NTTTCP)](/azure/virtual-network/virtual-network-bandwidth-testing). ### [Accelerators](#tab/sizeaccelerators) Accelerator (GPUs, FPGAs, etc.) info for each size > [!NOTE] > No accelerators are present in this series. --- ## Feature support |Feature name | Support status | | --- | --- | |[Premium Storage](../../premium-storage-performance.md)| Supported | |[Premium Storage caching](../../premium-storage-performance.md)| Supported | |[Live Migration](../../maintenance-and-updates.md)| Not Supported | |[Memory Preserving Updates](../../maintenance-and-updates.md)| Not Supported | |[Generation 2 VMs](../../generation-2.md)| Supported | |[Generation 1 VMs](../../generation-2.md)| Supported | |[Accelerated Networking](/azure/virtual-network/create-virtual-machine-accelerated-networking)| Supported | |[Ephemeral OS Disk](../../ephemeral-os-disks.md)| Supported | |[Nested Virtualization](/virtualization/hyper-v-on-windows/user-guide/nested-virtualization)| Supported | |[Hibernation](../../hibernate-resume.md)| Not Supported | |[Write Accelerator](/azure/virtual-machines/how-to-enable-write-accelerator)| Supported | [!INCLUDE [sizes-footer](../includes/sizes-footer.md)]