Basv2 sizes series

Basv2-series virtual machines run on the AMD's third Generation EPYC™ 7763v processor in a multi-threaded configuration with up to 256 MB L3 cache configuration. This series provides low cost CPU burstable general purpose virtual machines. Basv2-series virtual machines utilize a CPU credit model to track how much CPU is consumed. The virtual machine accumulates CPU credits when a workload is operating below the base CPU performance threshold and uses credits when running above the base CPU performance threshold, until all of its credits are consumed. Upon consuming all the CPU credits, a Basv2-series virtual machine is throttled back to its base CPU performance until it accumulates the credits to CPU burst again.

Basv2-series virtual machines offer a balance of compute, memory, and network resources, and are a cost effective way to run a broad spectrum of general purpose workloads. These include large scale micro-services, small and medium databases, virtual desktops, and business-critical applications. This series also offers an affordable option to run your code repositories and dev/test environments. Basv2-Series offers virtual machines of up-to 32 vCPU and 128 Gib of RAM, with max network bandwidth of upto 6,250 Mbps and max uncached disk throughput of 600 Mbps. Basv2-series virtual machines also support attachments of Standard SSD, Standard HDD, Premium SSD types with a default Remote-SSD support. You can also attach Ultra Disk storage based on its regional availability. Disk storage is billed separately from virtual machines.

Read more about the B-series CPU credit model.

Host specifications

Part	Quantity ^{Count Units}	Specs ^{SKU ID, Performance Units, etc.}
Processor	2 - 32 vCPUs	AMD EPYC 7763v (Milan) [x86-64]
Memory	1 - 128 GiB
Local Storage	None
Remote Storage	4 - 32 Disks	4,000 - 26,000 IOPS 85 - 600 MBps Disk Types: Premium SSD
Network	2 - 4 NICs	6,250 Mbps Interfaces: NetVSC, ConnectX
Accelerators	None

For features supported by this series, see the Feature support section.

Sizes in series

vCPUs (Qty.) and Memory for each size

Size Name	vCPUs (Qty.)	Memory (GB)
Standard_B2ats_v2	2	1
Standard_B2als_v2	2	4
Standard_B2as_v2	2	8
Standard_B4als_v2	4	8
Standard_B4as_v2	4	16
Standard_B8als_v2	8	16
Standard_B8as_v2	8	32
Standard_B16als_v2	16	32
Standard_B16as_v2	16	64
Standard_B32als_v2	32	64
Standard_B32as_v2	32	128

VM Basics resources

Check vCPU quotas

Base CPU performance, Credits, and other CPU bursting related info

Size Name	Base CPU Performance of VM (%)¹	Initial Credits (Qty.)	Credits banked/hour (Qty.)	Max Banked Credits (Qty.)
Standard_B2ats_v2	20%	60	24	576
Standard_B2als_v2	30%	60	36	864
Standard_B2as_v2	40%	60	48	1,152
Standard_B4als_v2	30%	120	72	1,728
Standard_B4as_v2	40%	120	96	2,304
Standard_B8als_v2	30%	240	144	3,456
Standard_B8as_v2	40%	240	192	4,608
Standard_B16als_v2	30%	480	288	6,912
Standard_B16as_v2	40%	480	384	9,216
Standard_B32als_v2	30%	960	576	13,824
Standard_B32as_v2	40%	960	768	18,432

CPU Burst resources

¹The base CPU performance metric hasn't changed. The updated (2024) numbers were normalized using a 0 - 100% scale. Previously, the scale was 0 - (vCPU x 100%).
Learn more about CPU bursting

Remote (uncached) storage info for each size

Size Name	Max Remote Storage Disks (Qty.)	Uncached Premium SSD IOPS	Uncached Premium SSD Throughput (MBps)	Uncached Premium SSD Burst¹ IOPS	Uncached Premium SSD Burst¹ Throughput (MBps)
Standard_B2ats_v2	4	3,750	85	10,000	960
Standard_B2als_v2	4	3,750	85	10,000	960
Standard_B2as_v2	4	3,750	85	10,000	960
Standard_B4als_v2	8	6,400	145	20,000	960
Standard_B4as_v2	8	6,400	145	20,000	960
Standard_B8als_v2	16	12,800	290	20,000	960
Standard_B8as_v2	16	12,800	290	20,000	960
Standard_B16als_v2	32	25,600	600	40,000	960
Standard_B16as_v2	32	25,600	600	40,000	960
Standard_B32als_v2	32	25,600	600	80,000	960
Standard_B32as_v2	32	25,600	600	80,000	960

Storage resources

Table definitions

¹Some sizes support bursting 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 1,024^3 bytes. When you compare disks measured in GB (1,000^3 bytes) to disks measured in GiB (1,024^3) remember that capacity numbers given in GiB may appear smaller. For example, 1,023 GiB = 1,098.4 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.

Network interface info for each size

Size Name	Max NICs (Qty.)	Max Network Bandwidth (Mbps)
Standard_B2ats_v2	2	6,250
Standard_B2als_v2	2	6,250
Standard_B2as_v2	2	6,250
Standard_B4als_v2	2	6,250
Standard_B4as_v2	2	6,250
Standard_B8als_v2	2	6,250
Standard_B8as_v2	2	6,250
Standard_B16als_v2	4	6,250
Standard_B16as_v2	4	6,250
Standard_B32als_v2	4	6,250
Standard_B32as_v2	4	6,250

Networking resources

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
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.
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).

Feature support

Feature name	Support status
Premium Storage	Supported
Premium Storage caching	Supported
Live Migration	Supported
Memory Preserving Updates	Supported
Generation 2 VMs	Supported
Generation 1 VMs	Supported
Accelerated Networking	Supported
Ephemeral OS Disk	Not Supported
Nested Virtualization	Not Supported

Other size information

List of all available sizes: Sizes

Pricing Calculator: Pricing Calculator

Information on Disk Types: Disk Types

Next steps

Take advantage of the latest performance and features available for your workloads by changing the size of a virtual machine.

Learn how to Monitor Azure virtual machines.

Last updated on 2026-04-02