248 questions with Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V tags
Hyper-V CSV Read Cache Eating All RAM & Crashing Hosts—How to Cap BlockCacheSize?
High-read workloads are blowing out our Hyper-V cluster's CSV Read Cache and starving the hosts of RAM, causing node crashes. What's the best way to cap BlockCacheSize via PowerShell to stop these OOM errors?
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
How should a CSV be recovered after a temporary cluster network failure?
After a brief network flap on one Hyper-V cluster node, one of our Cluster Shared Volumes remained in a Paused state and reported error 0xc000020c. Cluster networking has already recovered, but the affected CSV did not return to normal access…
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
When will Debian 13 be officially supported by Microsoft as a guest OS on on Hyper-V?
We are looking to upgrade our Debian Servers running as VM's on our Server 2025 Hyper-V Virtualization platform but the documentation suggests only Version 10,11 and 12 are…
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
Hyper-V Live Migration 0x80072746 (CPU Generation Mismatch) — Bulk enabling Processor Compatibility via PowerShell?
Quick hardware mismatch headache: Live Migrations in our cluster keep crashing with Error 0x80072746 because some hosts are on different CPU generations. I know turning on Processor Compatibility Mode fixes the CPU feature set mismatch, but what’s the…
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
My Hyper-V guest VM is stuck in an Unmapped state
I'm having real problems with a guest VM on our Hyper-V cluster. It has entered an Unmapped state because the .VMCX configuration file remains locked by an orphaned vmwp.exe process from a previous cluster node. And I can't work out how to release the…
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
ReFS kernel dump truncation (12%) on Hyper-V CSV failure – How to configure DedicatedDumpFile to a raw/local disk tier
1. Environment: OS: Windows Server 2022 Datacenter (Hyper-V Cluster) Storage: ReFS on Cluster Shared Volumes (CSV) 2. Issue Summary: During an unhandled ReFS metadata exception on a Hyper-V host node, the system fails to write a complete kernel dump…
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
Docker build hangs only on one Hyper-V host
Details I am troubleshooting a Docker build issue in a corporate environment. All hostnames, IP addresses, repository names, and other identifying information have been anonymized for security reasons. Environment Impacted Host: Dedicated Windows…
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
Gen 2 VM stuck at boot post-Live Migration — Secure Boot template mismatch
Guys, quick check. Live-migrated a Gen 2 VM across nodes in the cluster and it failed to boot up straight after. Looks like the target node Secure Boot template is out of sync with the source node. To prevent this kind of silent failure, how do you all…
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
Hyper-V Remote Access Fails After CredSSP Patch
How can I restore remote Hyper-V Manager access without weakening the CredSSP security fix?
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
Live migration Failed between cluster
Hi every One Can any one give me solution for this i am getting migration fail in quick and live migration , getting error below Live migration of 'Virtual Machine DC1' failed. Virtual machine migration operation for 'DC1' failed at migration…
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
Unique system parameters even in case of VM clone
Hello, I am looking for some unique parameters with which I can identify the virtual machine uniquely. Even if VMs are clonned (by any type of option available), I should get the different values for different VMs i.e. original and clone should have…
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
Hyper-v v-NIC has span traffic issue.
I have a HPE Proliant DL360 gen11 with a pair of HYPER-V failover cluster and external iscsi storage. On the Hyper-v host The server running window server 2022 standard. I have created hyper-v v-switch. The solution is span traffic from cisco…
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
Windows Server 2025 (26100): vmicvss fails to start with Event 7009 connect timeout on multiple guests - production checkpoints and backups broken
Environment: Host: Windows Server 2025 Standard, build 26100, standalone (workgroup) Guests: 2x Windows Server 2025, VM config version 12.0 (one Domain Controller, one File Server) Updates: KB5094137, KB5094125 (June 2026 CUs),…
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
Hyper-V Reference Point / Production Checkpoint failures on Windows Server 2025
Dear Microsoft Support, We are experiencing intermittent Hyper-V Reference Point / Production Checkpoint related failures on a newly deployed Windows Server 2025 Hyper-V host. Environment Host OS: Microsoft Windows Server 2025 Standard OS Build:…
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
Is Oracle Linux 8.9 supported to run as a virtual machine on Windows Server Hyper‑V?
Is it supported to run Oracle Linux 8.9 as a virtual machine on Windows Server Hyper-V? We checked the following documentation, but Oracle Linux 8.9 is not listed there, while Oracle Linux 9.0 is listed. Therefore, we are unsure about the support status…
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
'XXXXXXX' could not create auto virtual hard disk D:\XXXX\XXXXXX\Virtual Hard Disks\XXXXXX_D3EAF5D6-C04A-44B6-84C3-906557407102.avhdx: The process cannot access the file because it is being used by another process. (0x80070020)
We are using commvault for taking hyper v backup. but getting this error while backup Error creating virtual machine [XXXXXX] snapshot. Please check the virtual machine snapshot tree and the hosting volume for free space. [Checkpoint operation for…
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
Installing Ubuntu 24.04 on a Hyper-V virtual machine hosted on Windows Server 2019.
Dear Microsoft Support Team, We are experiencing an issue while installing Ubuntu 24.04 on a Hyper-V virtual machine hosted on Windows Server 2019. Environment Details: Host OS: Windows Server 2019 Hyper-V Version: Hyper-V Manager Guest OS: Ubuntu…
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
Obtaining IP address of Node inside Failover cluster
Hello, I would like to know how to obtain IP address of each node within a failover cluster. In my current setup, I have two nodes creating a failover cluster. In each node is running multiple VMs. I'm connected to one of the (cluster) node. What…
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
How to fix INACCESSIBLE BOOT DEVICE when loading up a Hyper V virtual machine
We are having the challenge of loading up the virtual machine that contains an application that was not accessible. after increasing the storage, and trying to boot the VM up, the vm is stuck in boot loop. How do we get back to the VM without damaging…
Windows for business | Windows Server | Storage high availability | Virtualization and Hyper-V
AHCI controller to be enabled in Hyper-V
We were using VMware earlier and did not encounter any issues with enabling AHCI mode. Now we are on Hyper-V VM and My current development work specifically involves kernel driver development in AHCI mode. Could you please advise if any additional…