Restarting Windows VM causes boot loop

[abooltink]

Hi,

I am using Proxmox VE 5.2-1 and installed a Windows Server 2016 VM. Everything works fine except restarting the VM i.e. after a Windows update. If the VM is restartet it keeps rebooting at the very beginning of the boot proces - just after finding the harddisk. The same happens if I select "reset" in the Web-GUI.

This does not happen if the VM is shut down. If the VM is shut down either from within the OS, through the Web-GUI or from the command line it just boots perfectly afterwards.

Does anyone have an idea what could cause this?

Thanks in advance for your answers,
Axel

 

[dcsapak]

can you post your vm config?

 

[abooltink]

Hi Dominik,

Yes, here it is:
----
agent: 1
balloon: 2048
bootdisk: virtio0
cores: 2
cpu: host
memory: 6144
name: srv03
net1: virtio=1E4:0A:A6:CF:37,bridge=vmbr0
numa: 0
ostype: win10
scsihw: virtio-scsi-pci
smbios1: uuid=74f6cc45-240e-4b63-b0ee-0fba1f73ff9a
sockets: 2
virtio0: local-lvm:vm-101-disk-1,cache=writeback,size=400G
----

Regards,
Axel

 

[dcsapak]

you could try to use 'nocache' instead of writeback and scsi instead of virtio

 

[abooltink]

Hi Dominik,

using 'nocache' and restarting the host seems to have solved this issue, I will keep an eye on it.

Thanks for your support,
Best regards,
Axel

 

[pakradm]

Hello,
Why we should set cache to nocache?
This problem only occur on Windows Server 2016 & 2019 & we don't have it on Windows Server 2012 R2 with SCSI & writeback