Will resizing of my VM from B-series to D-series remove data from my application.

Question

Will resizing of my VM from B-series to D-series remove data from my application.

Braden Bowie 40

I have a Virtual Machine with OS Linux (ubuntu 24.04). It is the B4ms series.

I am looking to upgrade to D-series to make performance more stable. The VM is running an app that is currently in production. I am wondering if resizing to a different series will delete the application itself or even delete user data.

Thanks

Braden Bowie 40 Reputation points

2025-05-02T06:45:10.5466667+00:00

Hi @Pramidha Yathipathi

How can I tell if it is temporary storage or persistent. Would it be something I find it in the virtual machine settings, or would I have to actually go into the virtual machine to check? It says the local storage is 32(SCSI) and it is running Linux.Thanks for the help
Pramidha Yathipathi 685 Reputation points Microsoft External Staff Moderator

2025-05-02T08:18:35.3133333+00:00

Hi Braden Bowie,

To determine whether your Azure Linux VM's storage is temporary or persistent, you can inspect the VM's disk configuration from within the operating system.

Check the below document here by using the linux command > lsblk you can get the name of the disk and the size, Type and mount point.

The sdb is a temporary disk provided by Azure (commonly /dev/sdb on Linux) as it is not shown in the Azure portal's Disks blade and cannot be managed through the portal.

Sdc mount point is the data disk.

Please refer the below:

https://learn.microsoft.com/en-us/answers/questions/2260534/resizing-a-attached-data-disk-on-linux

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Pramidha Yathipathi 685 Reputation points Microsoft External Staff Moderator

2025-05-05T05:27:19.92+00:00

Hi Braden Bowie,

I hope your doing well and issue resolved, let me know if you have any further queries we are happy to assist you.

As information is helpful, please click "Upvote" and "Accept Answer" below.

Accepted answer will help other community members navigate to the appropriate solutions.

Accepted answer

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Braden Bowie 40 Reputation points

2025-05-02T06:45:10.5466667+00:00

Hi @Pramidha Yathipathi

How can I tell if it is temporary storage or persistent. Would it be something I find it in the virtual machine settings, or would I have to actually go into the virtual machine to check? It says the local storage is 32(SCSI) and it is running Linux.Thanks for the help
Pramidha Yathipathi 685 Reputation points Microsoft External Staff Moderator

2025-05-02T08:18:35.3133333+00:00

Hi Braden Bowie,

To determine whether your Azure Linux VM's storage is temporary or persistent, you can inspect the VM's disk configuration from within the operating system.

Check the below document here by using the linux command > lsblk you can get the name of the disk and the size, Type and mount point.

The sdb is a temporary disk provided by Azure (commonly /dev/sdb on Linux) as it is not shown in the Azure portal's Disks blade and cannot be managed through the portal.

Sdc mount point is the data disk.

Please refer the below:

https://learn.microsoft.com/en-us/answers/questions/2260534/resizing-a-attached-data-disk-on-linux

If you found information is helpful, please click "Upvote" on the post to let us know.

If you have any further queries feel free to reach out us.

As information is helpful, please click "Upvote" and "Accept Answer" .

Accepted answer will help other community members navigate to the appropriate solutions.

Thank You.
Pramidha Yathipathi 685 Reputation points Microsoft External Staff Moderator

2025-05-05T05:27:19.92+00:00

Hi Braden Bowie,

I hope your doing well and issue resolved, let me know if you have any further queries we are happy to assist you.

As information is helpful, please click "Upvote" and "Accept Answer" below.

Accepted answer will help other community members navigate to the appropriate solutions.

Answer 1

Hi Braden Bowie,

Resizing your Azure Virtual Machine (VM) from a B-series (e.g., B4ms) to a D-series will not delete your application or user data, provided that your application and data are stored on persistent disks (OS or data disks). However, it's important to note that the VM will undergo a restart during the resizing process, which can cause temporary downtime.

Limitations:

You can't resize a VM size that has a local temp disk to a VM size with no local temp disk and vice versa. The only combinations allowed for resizing are:

VM (with local temp disk) -> VM (with local temp disk); and
VM (with no local temp disk) -> VM (with no local temp disk).

You can't resize a VM size that has a SCSI-based VM to a VM size that has a remote NVMe-enabled VM.

Please refer the document:

https://learn.microsoft.com/en-us/azure/virtual-machines/sizes/resize-vm?tabs=portal

If you found information is helpful, please click "Upvote" on the post to let us know.

If you have any further queries feel free to reach out us.

Thank You.

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Will resizing of my VM from B-series to D-series remove data from my application.

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