Azure Virtual Machine Increase Disk Size: A Step-by-Step Guide

Increasing the disk size of an Azure Virtual Machine can be a bit tricky, but don't worry, I've got you covered.

To start, you'll need to ensure that your VM is running and not deallocated. This is because you can't increase the disk size of a VM that's not running.

Next, you'll need to identify the disk you want to increase in size, which is usually the OS disk. You can do this by checking the disk configuration in the Azure portal or using the Azure CLI.

To increase the disk size, you'll need to use the Azure CLI command `az vm update` with the `--size` option. This will allow you to specify the new size of the disk.

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To increase the disk size of your Azure Virtual Machine, you'll need to meet some prerequisites. First, you'll need to be on the Microsoft Azure home page, specifically in the Virtual Machines section.

You should also have a VM that you want to resize, which you'll stop by clicking the Stop button in the toolbar. After stopping the VM, navigate to the Settings section and click on Disks.

From there, you'll see a list of attached disks to your VM, and you'll need to select the one you want to resize.

Azure VM disk size is a crucial aspect to consider when increasing the disk size of your virtual machine. You can resize a managed disk in the Azure portal by stopping the VM, selecting the disk, and specifying the new size.

The maximum allowed disk size is 4,095 GB for OS disks, but you can expand the VHD blob beyond that size. However, the OS will only work with the first 4,095 GB of space.

Before changing the disk size, it's essential to check if the disk is the bottleneck. You can check the free space in the operating system, but it's more complicated to determine if the disk is the bottleneck for performance.

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To troubleshoot your issue, you can use Azure Portal to view disk metrics. The overview blade provides some input, and you can click on See all metrics for more information.

Here are the steps to check if you need to change the disk size:

To change the operating system disk size, you need to shut down the Azure VM. Once the VM is stopped, you can click on Disks in the left menu and select the disk you want to change.

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Azure Virtual Machines can be increased in disk size in certain regions, including East US, West US, and Central US.

You can check the availability of this feature in your region by visiting the Azure portal and searching for "disk size increase" in the search bar.

The disk size increase feature is available for Standard and Premium Storage, but not for Ultra Disks.

In regions where the feature is available, you can increase the disk size of your Virtual Machine up to 32 TB.

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Resizing a VM is a straightforward process in Azure, but it does require some planning. You can resize a managed disk in the Azure portal by stopping the virtual machine, selecting the disk you want to expand, and then choosing the new size.

To expand a disk without downtime, your disk must meet certain requirements, but if it does, you can skip some steps. The new size should be greater than the existing disk size, and the maximum allowed is 4,095 GB for OS disks.

In the Azure portal, you can resize a managed disk by going to the virtual machine, stopping it, and then selecting the disk you want to expand. From there, you can choose the new size and select Resize.

You can also use PowerShell to resize a managed disk, but you'll need to stop the VM first. The new size should be greater than the existing disk size, and the maximum allowed is 4,095 GB for OS disks.

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If you're using a classic VM SKU, you might not be able to expand disks without downtime, but you can use a PowerShell script to determine which VM SKUs support it.

Here are the basic steps to resize a VM disk in the Azure Portal:

Note that you can also type in a custom disk size, but you'll still incur charges for the predefined disk SKU size.

To increase the disk size of an Azure virtual machine, you'll need to detach the existing disk and attach a new, larger one.

First, stop the virtual machine to prevent any data loss during the process.

Next, navigate to the Azure portal and select the virtual machine you want to modify.

Then, click on the "Disks" tab and select the disk you want to increase in size.

You can increase the size of the disk up to 32 TB, which is the maximum size supported by Azure.

After increasing the disk size, you'll need to create a new disk with the increased size.

Attach the new disk to the virtual machine and then detach the old disk.

Finally, you can delete the old disk to free up space in your Azure storage.

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If you're dealing with a managed disk, you can resize it up to 4 TB in a single operation.

Resizing a disk can cause downtime for your virtual machine, so it's essential to plan ahead and consider the impact on your application.

For managed disks, the resize operation can take up to 30 minutes to complete, depending on the size of the disk and the available resources.

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If you're using a classic VM SKU, expanding disks without downtime might not be an option.

Some classic VM SKUs don't support expanding disks without downtime, so it's essential to check which ones do.

You can use a PowerShell script to determine which VM SKUs support expanding disks without downtime.

Classic VM SKUs that support expanding disks without downtime can be found using this script.

After completing the Azure disk resize, you'll need to expand the associated volume in the OS to use the new capacity. This is a crucial step to ensure your applications can take advantage of the expanded disk space.

In Windows virtual machines, you'll need to go into the OS and expand the volume to encompass the new space. There are several methods for expanding a partition, including using Diskpart or Disk Manager.

For Linux virtual machines, the process is similar, but the exact steps may vary depending on the distribution and configuration of your OS. You'll need to update the OS configuration to reflect the new disk size.

To determine which VM SKUs support expanding disks without downtime, you can use the following PowerShell script. This will help you identify if your VM is eligible for a seamless disk expansion.

Keep in mind that if you're using a classic VM SKU, you may need to take additional steps to expand the disk, including stopping the VM and using PowerShell to resize the disk.