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Merge pull request #808 from MicrosoftDocs/main
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12/31/2024 PM Publish
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PhilKang0704 authored Dec 31, 2024
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### Expand with Ultra Disk and Premium SSD v2

Expanding Ultra Disks and Premium SSD v2 disks have the following additional limitations:
- You can't expand a disk while a [background copy](../scripts/create-managed-disk-from-snapshot.md#performance-impact---background-copy-process) of data is also occurring on that disk, like when a disk is being hydrated from [snapshots](https://learn.microsoft.com/azure/virtual-machines/disks-incremental-snapshots?tabs=azure-cli).
- You can't expand a disk while a [background copy](../scripts/create-managed-disk-from-snapshot.md#performance-impact---background-copy-process) of data is also occurring on that disk, like when a disk is being backfilled from [snapshots](https://learn.microsoft.com/azure/virtual-machines/disks-incremental-snapshots?tabs=azure-cli).
- You can't expand a VM that's using [NVMe controllers](../nvme-overview.md) for Ultra Disks or Premium SSD v2 disks without downtime.

> [!IMPORTANT]
> Allow up to ten minutes for the correct size to be reflected in Windows VMs and Linux VMs. For Linux VMs, you must perform a [Linux rescan function](https://learn.microsoft.com/azure/virtual-machines/linux/expand-disks?tabs=ubuntu#detecting-a-changed-disk-size) For Windows VM that doesn't have a workload, you must perform a [Windows rescan function](https://learn.microsoft.com/windows-hardware/drivers/devtest/devcon-rescan). You can rescan immediately, but if it's within ten minutes, you might need to rescan again to display the correct size.
> Allow up to 10 minutes for the correct size to be reflected in Windows VMs and Linux VMs. For Linux VMs, you must perform a [Linux rescan function](https://learn.microsoft.com/azure/virtual-machines/linux/expand-disks?tabs=ubuntu#detecting-a-changed-disk-size). For Windows VM that doesn't have a workload, you must perform a [Windows rescan function](https://learn.microsoft.com/windows-hardware/drivers/devtest/devcon-rescan). You can rescan immediately, but if it's within 10 minutes, you might need to rescan again to display the correct size.

#### Regional availability

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