how many volume can creation in azure VM

Question

I has a volume (H:) type is NTFD, which one cluster is 4 K, so that volume(H:) max space size is 16 TB, but is enough space for us project.

we want to creation new volume in azure VM, so how many volume can be create? it is limit for volume?

Answer 1

Hi Winston,

When it comes to Azure VMs, the number of data disks you can attach is primarily influenced by your VM's size and series. Here's a quick breakdown:

• Size and Type of VM: Different VM sizes and series in Azure allow for a different number of attached data disks. For example, a Standard_D4s_v3 VM allows for up to 8 data disks, while a Standard_D64s_v3 VM can support up to 32 data disks.
• Maximum Disk Size: As I recall, the maximum size for a managed disk in Azure is 32 TiB (using the Ultra Disk type). Other disk types like Premium SSD, Standard SSD, and Standard HDD have their own size limits. Ensure you choose the right disk type based on your performance and size requirements.
• Volume Size Limitation: NTFS itself has a theoretical maximum volume size of 256 TiB with a 64 KB cluster size. With a 4 KB cluster size, as in your case, 16 TiB is indeed the limit.
• Azure Limits: Azure does impose limits on the number of managed disks you can have per subscription and per region, but these are typically quite high and shouldn't be a concern for most projects. These limits might change over time, so always consult the Azure official documentation for the most up-to-date information.
• Practical Considerations: While you might be technically allowed to attach a certain number of disks to your VM, always consider the I/O and throughput requirements. Attaching a large number of high-performance disks to a VM that doesn't support the required I/O throughput would be counterproductive. To determine the exact number of volumes (data disks) you can create and attach to your specific VM, you should:

1. Check the Azure VM size documentation to see the limits of your VM size and series.
2. Consult the Azure subscription and service limits documentation to understand any overarching limitations.

Finally, if you find yourself frequently pushing up against these limits, it might be worth revisiting your infrastructure design or considering other Azure storage solutions like Azure Blob Storage or Azure Files based on the nature of your project.

I hope this helps with your query?