id = 2919
title = "qemu-ga update resetting VssOption Registry key to default"
state = "opened"
created_at = "2025-04-10T14:56:21.810Z"
closed_at = "n/a"
labels = ["Guest Agent", "guest: Windows"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/2919"
host-os = "Proxmox 8.3.5"
host-arch = "x86"
qemu-version = "n/a"
guest-os = "Windows Server 2022, 2024/04 patch."
guest-arch = "x86"
description = """Before I installed the .exe from iso `virtio-win-0.1.271.iso`, I had value 5 in registry key `HKLM:\\SYSTEM\\CurrentControlSet\\Services\\QEMU Guest Agent VSS Provider\\VssOption`.
After the driver update by the .exe, the value was set to 1.

This registry key shouldn't change in driver update, as its value was manually set to 5 and it is important to preserve MSSQL backups in Proxmox.
Source:
https://blog.datact.ch/backup-mssql-server-with-proxmox
https://forum.proxmox.com/threads/pbs-breaking-customer-sql-backups-backups-without-fs-freeze.111526/"""
reproduce = """1. Set a value to `HKLM:\\SYSTEM\\CurrentControlSet\\Services\\QEMU Guest Agent VSS Provider\\VssOption` other than 1.
2. Install the .exe from version 0.1.271.
3. Check the key value."""
additional = "n/a"