Boot problem Changing from Virtio to SCSI Virtio on Windows srv 2016


Active Member
Nov 18, 2011
i'm testing Win2016 server VM,
using Virtio disk ( no SCSI VIRTIO ) i have very slow I/O performance ( Write Back or NoCACHE ).
Is it better to switch to SCSI VIRTIO ?
I have tried but the VM can't boot .. need i a new setup from zero or can i switch in some way from Virtio to SCSI VIRTIO ?

Some tips to have more performance on Windown 2016 Server I/O ?

I have 64G Ram,
2 x 3TB sata HD

I have tested with standard ARC cache and with 8G limit Arc Cache .. when the system fill all arch cache the write inside the VM go down near to zero...

pveversion -V
proxmox-ve: 5.1-41 (running kernel: 4.15.10-1-pve)
pve-manager: 5.1-46 (running version: 5.1-46/ae8241d4)
pve-kernel-4.15.10-1-pve: 4.15.10-4
pve-kernel-4.13.13-6-pve: 4.13.13-42
pve-kernel-4.13.13-2-pve: 4.13.13-33
corosync: 2.4.2-pve3
criu: 2.11.1-1~bpo90
glusterfs-client: 3.8.8-1
ksm-control-daemon: 1.2-2
libjs-extjs: 6.0.1-2
libpve-access-control: 5.0-8
libpve-common-perl: 5.0-30
libpve-guest-common-perl: 2.0-14
libpve-http-server-perl: 2.0-8
libpve-storage-perl: 5.0-18
libqb0: 1.0.1-1
lvm2: 2.02.168-pve6
lxc-pve: 3.0.0-2
lxcfs: 3.0.0-1
novnc-pve: 0.6-4
proxmox-widget-toolkit: 1.0-14
pve-cluster: 5.0-20
pve-container: 2.0-21
pve-docs: 5.1-17
pve-firewall: 3.0-7
pve-firmware: 2.0-4
pve-ha-manager: 2.0-5
pve-i18n: 1.0-4
pve-libspice-server1: 0.12.8-3
pve-qemu-kvm: 2.11.1-5
pve-xtermjs: 1.0-2
qemu-server: 5.0-22
smartmontools: 6.5+svn4324-1
spiceterm: 3.0-5
vncterm: 1.5-3
zfsutils-linux: 0.7.7-pve1~bpo9



Oct 23, 2017
It should work, have you check the tab "options" -> Boot Order and set "Disk ´scsi0´" ?
Last edited:


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