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support/azure/virtual-machines/linux/linux-vm-no-boot-hyper-v-driver-issues.md

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@@ -13,21 +13,21 @@ When you run a Linux Virtual Machine (VM) on Azure, the Hyper-V drivers, also kn
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## Prerequisites
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- Access to [Azure Command-Line Interface (CLI)](/cli/azure/).
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- Access to [Azure Command-Line Interface (CLI)](/cli/azure/)
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- Ability to create a repair/rescue VM
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- Serial console access
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- Familiarity with Linux commands and system administration
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## Symptoms
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In one of the following scenarios, VMs might fail to boot due to missing Hyper-V drivers:
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In one of the following scenarios, Linux VMs might fail to boot because Hyper-V drivers are missing or disabled:
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- After you migrate a Linux VM from on-premises to Azure.
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When a VM is migrated to Azure from another hypervisor (such as VMware or Kernel-based Virtual Machine (KVM)), the necessary Hyper-V drivers `hv_vmbus`, `hv_storvsc`, `hv_netvsc`, and `hv_utils` might not be installed or enabled, preventing the VM from detecting storage and network devices.
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- When the Hyper-V drivers aren't included in the initramfs.
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- After you disable the Hyper-V drivers and reboot the VM.
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- When the Hyper-V drivers aren't included in the initramfs.
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When you review the serial console logs for various Linux VMs (Red Hat, Oracle, SUSE, or Ubuntu), the following issues are commonly observed:
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| **Failure to Attach Azure Disks** | Azure managed disks might not be recognized or mounted correctly due to missing storage drivers. |
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| **Cloud-Init or Waagent Failures** | Azure provisioning tools (`cloud-init` or `waagent`) might fail to configure the VM properly. |
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Here are log examples:
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Here are log entry examples:
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- Output 1
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