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 disk 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 (Genoa) [x86-64] |
| Memory |
1 - 128 GiB |
|
| Local Storage |
None |
|
| Remote Storage |
4 - 32 Disks |
3750 - 25,600 IOPS
85 - 600 MBps |
| Network |
2 - 4 NICs |
6250 Mbps |
| Accelerators |
None |
|
Feature support
Premium Storage: Supported
Premium Storage caching: Supported
Live Migration: Supported
Memory Preserving Updates: Supported
Generation 2 VMs: Supported
Generation 1 VMs: Not Supported
Accelerated Networking: Supported
Ephemeral OS Disk: Not Supported
Nested Virtualization: Not Supported
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
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 |
1152 |
| Standard_B4als_v2 |
30% |
120 |
72 |
1728 |
| Standard_B4as_v2 |
40% |
120 |
96 |
2304 |
| Standard_B8als_v2 |
30% |
240 |
144 |
3456 |
| Standard_B8as_v2 |
40% |
240 |
192 |
4608 |
| Standard_B16als_v2 |
30% |
480 |
288 |
6912 |
| Standard_B16as_v2 |
40% |
480 |
384 |
9216 |
| Standard_B32als_v2 |
30% |
960 |
576 |
13824 |
| Standard_B32as_v2 |
40% |
960 |
768 |
18432 |
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
Local (temp) storage info for each size
Remote (uncached) storage info for each size
| Size Name |
Max Remote Storage Disks (Qty.) |
Uncached Premium SSD Disk IOPS |
Uncached Premium SSD Throughput (MB/s) |
Uncached Premium SSD Burst1 IOPS |
Uncached Premium SSD Burst1 Throughput (MB/s) |
| Standard_B2ats_v2 |
4 |
3750 |
85 |
10,000 |
960 |
| Standard_B2als_v2 |
4 |
3750 |
85 |
10,000 |
960 |
| Standard_B2as_v2 |
4 |
3750 |
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 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.
Network interface info for each size
| Size Name |
Max NICs (Qty.) |
Max Network Bandwidth (Mb/s) |
| Standard_B2ats_v2 |
2 |
6250 |
| Standard_B2als_v2 |
2 |
6250 |
| Standard_B2as_v2 |
2 |
6250 |
| Standard_B4als_v2 |
2 |
6250 |
| Standard_B4as_v2 |
2 |
6250 |
| Standard_B8als_v2 |
2 |
6250 |
| Standard_B8as_v2 |
2 |
6250 |
| Standard_B16als_v2 |
4 |
6250 |
| Standard_B16as_v2 |
4 |
6250 |
| Standard_B32als_v2 |
4 |
6250 |
| Standard_B32as_v2 |
4 |
6250 |
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).
Accelerator (GPUs, FPGAs, etc.) info for each size
Note
No accelerators are present in this series.
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.