azure-vms-no-temp-disk.yml

### YamlMime:FAQ
metadata:
  title: FAQ Azure VM sizes with no local temporary disk 
  description: This article provides answers to frequently asked questions (FAQ) about Microsoft Azure VM sizes that don’t have local temporary disk. 
  author: brbell 
  ms.service: azure-virtual-machines
  ms.topic: faq
  ms.subservice: sizes
  ms.author: brbell
  ms.reviewer: mimckitt
  ms.date: 06/15/2020 
title: Azure VM sizes with no local temporary disk 
summary: |
  > [!TIP]
  > Try the **[Virtual Machine selector tool](https://aka.ms/vm-selector)** to find other sizes that best fit your workload.

  This article provides answers to frequently asked questions (FAQ) about Azure VM sizes that don't have a local temporary disk (that is, no local temp disk).
  

sections:
  - name: Ignored
    questions:
      - question: |
          What does no local temp disk mean? 
        answer: |
          Traditionally, we have had VM sizes (for example, Standard_D2s_v3, Standard_E48_v3) that include a small local disk (that is, a D: Drive). With the VM series such as [Dasv5](dasv5-dadsv5-series.md) and [Easv5](easv5-eadsv5-series.md) that small local disk no longer exists. However, you can still attach Standard HDD, Premium SSD or Ultra SSD to use as remote storage.
          
      - question: |
          What if I still want a local temp disk?
        answer: |
          If your workload requires a local temporary disk, we still offer sizes such as the [Dadsv5](dasv5-dadsv5-series.md). 
          
          > [!NOTE]
          > Local temporary disk isn't persistent; to ensure your data is persistent, please use Standard HDD, Premium SSD or Ultra SSD options. 

          
      - question: |
          Can I resize a VM size that has a local temp disk to a VM size with no local temp disk?  
        answer: |
          No. The only combinations allowed for resizing are: 
          
          1. VM (with local temp disk) -> VM (with local temp disk); and 
          2. VM (with no local temp disk) -> VM (with no local temp disk). 
          
          If interested in a work around, please see next question.
          
          > [!NOTE]
          > If an image depends on the resource disk, or a pagefile or swapfile exists on the local temp disk, the diskless images won't work—instead, use the ‘with disk’ alternative. 
          
      - question: |
          How do I migrate from a VM size with local temp disk to a VM size with no local temp disk?  
        answer: |
          You can migrate by following these steps: 
          
          1. Connect to your Virtual Machine that has a local temporary disk (for example, a D: Drive) as a local admin.
          2. Follow the guidelines on the "Temporarily move pagefile.sys to C drive" section of [Use the D: drive as a data drive on a Windows VM](./windows/change-drive-letter.md) to move the page file from the local temporary disk (D: drive) to the C: drive.
          
             > [!NOTE]
             > Follow the guidelines on the "Temporarily move pagefile.sys to C drive" section of Use the D: drive as a data drive on a Windows VM to move page file from the local temporary disk (D: drive) to C: drive. **Deviation from the steps outlined will lead to the error message - "Unable to resize the VM since changing from resource disk to non-resource disk VM size and vice-versa is not allowed.**
          
          3. Take a snapshot of the VM by following the steps outlined in [Create a snapshot using the portal or Azure CLI](./linux/snapshot-copy-managed-disk.md). 
          4. Use snapshot to create a new diskless VM (such as, Dv5, Dsv5, Dasv5, Ev5, Esv5, Easv5 series) by following the steps outlined in [Create a virtual machine from a snapshot with CLI](/previous-versions/azure/virtual-machines/scripts/virtual-machines-linux-cli-sample-create-vm-from-snapshot). 
          
      - question: |
          Do these VM sizes support both Linux and Windows Operating Systems (OS)?
        answer: |
          Yes.

      - question: |
          Will this break my custom scripts, custom images or OS images that have scratch files or page files on a local temp disk?
        answer: |
          If the custom OS image points to the local temp disk, the image might not work correctly with this diskless size.
          
additionalContent: |

  ## Next steps
  
  In this document, you learned more about the most frequent questions related to Azure VMs with no local temp disk. For more information about these VM sizes, see the following articles:
  
  - [Specifications for Dv5 and Dsv5-series](dv5-dsv5-series.md)
  - [Specifications for Dasv5 and Dadsv5-series](dasv5-dadsv5-series.md)
  - [Specifications for Ev5 and Esv5-series](ev5-esv5-series.md)
  - [Specifications for Easv5 and Eadsv5-series](easv5-eadsv5-series.md)