When scaling up L-series VM in Azure, is the data on the NVMe disks preserved?

Mike 0

Say we have our 1.8 TB database mounted to the local NVMe disks on a L8s_v2 machine. If we scale up the VM to a L16s_v2 would the data be migrated to the new 3.6 TB disk?

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Nartan 0 Reputation points

2024-10-23T17:01:02.2133333+00:00
Hi Mike, I hope below explanation help you for the answer you are looking for. if yes please do upvote to this comment

I do not think the data on the NVMe disks is not preserved when scaling up or down an L-series VM in Azure. The NVMe storage in these VM types is ephemeral (temporary) and is designed for high-performance, low-latency storage, but it does not offer persistent data storage.

Here’s what happens with the NVMe disks in Azure L-series VMs:

Ephemeral Storage: The NVMe disks in L-series VMs are tied to the lifecycle of the virtual machine. When the VM is stopped, deallocated, or resized (scaling up or down), the data on these disks is lost.

Scaling Operations: When you scale up or down the VM (change its size), Azure will deallocate the current VM and create a new one with the specified size. During this process, the NVMe disks are re-initialized, and any data stored on them is erased.

Use Cases: NVMe disks in L-series VMs are typically used for workloads that require temporary high-speed storage, such as caching, temporary data processing, or scratch disks, where the loss of data is acceptable or the data can be easily re-generated.

If Data Persistence is Needed:

To ensure that your data is persistent when scaling VMs or stopping/deallocating them, you should use other storage options, such as:

• Azure Managed Disks (Standard or Premium SSDs): These disks are persistent across VM deallocations and resizing.

• Azure Blob Storage or Azure Files: Cloud-based storage options that offer high durability and persistence.

In summary, the NVMe disks in L-series VMs do not preserve data when you scale the VM. If data persistence is required, you should rely on Azure’s persistent storage options.
Keshavulu Dasari 2,420 Reputation points Microsoft Vendor

2024-10-24T17:51:05.6566667+00:00

Hi Mike,
Please do not forget to "Accept the answer” and “up-vote” wherever the information provided helps you, this can be beneficial to other community members.
Keshavulu Dasari 2,420 Reputation points Microsoft Vendor

2024-10-25T18:45:12.2566667+00:00

Hi Mike,
If you have any other questions or are still running into more issues, let me know in the "comments" and I would be happy to help you.
Thank you again for your time and patience throughout this issue. Please remember to "Accept Answer" if any answer/reply helped, so that others in the community facing similar issues can easily find the solution

1 answer

Keshavulu Dasari 2,420 Reputation points Microsoft Vendor

2024-10-23T17:04:57.3733333+00:00

Hi Mike ,
Welcome to Microsoft Q&A Forum, thank you for posting your query here!
When sizing an L-series VM in Azure, data is not stored on the NVMe disk. Local NVMe storage on Lsv2-series VMs is temporary, which means that data persists only when the VM is scheduled to restart, If the VM is reused, distributed, or deleted, the data on the local NVMe disk will not be retained

In your case, if you scale up from an L8s_v2 machine to an L16s_v2 machine, the data from the 1.8 TB NVMe disk will not migrate to the new 3.6 TB disk. You will need to manually back up the data before upgrading and then restore the new VM to the system

For more information:

https://learn.microsoft.com/en-us/azure/virtual-machines/sizes/storage-optimized/lsv2-series https://learn.microsoft.com/en-us/azure/virtual-machines/sizes/storage-optimized/l-family

If you have any other questions or are still running into more issues, let me know in the "comments" and I would be happy to help you

Please do not forget to "Accept the answer” and “up-vote” wherever the information provided helps you, this can be beneficial to other community members.
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When scaling up L-series VM in Azure, is the data on the NVMe disks preserved?

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