http://192.168.180.206:8001/ 2026-05-14T07:34:31+00:00 http://192.168.180.206:8001/ http://192.168.180.206:8001/_media/wiki:dokuwiki.svg text/html 2021-10-21T09:33:13+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/vm:proxmox:kvm:disk_passthrough?rev=1634808793&do=diff Disk passthrough it is possible to attach disk to running KVM machine. # Add SCSI drive: qm set 107 -scsi3 /dev/disk/by-id/ata-ADATA_SU800_2I0120040332 # Add single partition to SCSI controller: qm set 107 -scsi3 /dev/disk/by-id/ata-ADATA_SU800_2I0120040332-part3 # Remove drive: qm unlink 107 --idlist scsi3 text/html 2021-07-17T11:48:09+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/vm:proxmox:kvm:gpu_poassthrough?rev=1626522489&do=diff GPU passthrough AMD APU <https://gist.github.com/SimonTod/72945457c4d7e741a382ba9ce9c4731b> PCIe echo "blacklist nouveau" >> /etc/modprobe.d/blacklist.conf echo "blacklist nvidia" >> /etc/modprobe.d/blacklist.conf update-initramfs -u lcpci 26:00.0 VGA compatible controller: NVIDIA Corporation GT218 [GeForce 210] (rev a2) lspci -n -s 26:00.0 26:00.0 0300: 10de:0a65 (rev a2) echo "options vfio-pci ids=10de:0a65" > /etc/modprobe.d/vfio.conf rmmod vfio-pci modprobe vfio-pci dmesg [536167… text/html 2021-12-30T06:51:27+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/vm:proxmox:kvm:iothread?rev=1640847087&do=diff IO thread Enabled IO thread option is ignored when controler is other than VirtIO SCSI Single. KVM without iothread -device virtio-scsi-pci,id=scsihw0,bus=pci.0,addr=0x5 -drive file=/dev/zvol/nvmpool/data/vm-701-disk-1,if=none,id=drive-scsi0,discard=on,format=raw,cache=none,aio=io_uring,detect-zeroes=unmap -device scsi-hd,bus=scsihw0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0,id=scsi0,rotation_rate=1,bootindex=100 -drive file=/dev/zvol/hddpool/data/vm-701-disk-1,if=none,id=drive-scsi… text/html 2025-03-04T14:20:39+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/vm:proxmox:kvm:linux?rev=1741098039&do=diff Linux Guests Filesystem If ZFS is used on host (CoW filesystem) using CoW filesystem on guest generates overhead. Better is to use simple XFS or Ext4 if BTRFS snapshot and subvolumes functionality is not needed in guest. Linux Guest on BTRFS: * text/html 2022-02-23T12:07:51+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/vm:proxmox:kvm:shrink_disc?rev=1645618071&do=diff Shrink VM disc image Shrinking is not supported by Proxmox QEMU is not capable to resize ZFS raw data. Workaround: * Shrink disc in guest OS (i.e. using gparted to a bit smaller than desired block device size) * Change VM disc size. Two ways: text/html 2020-09-23T19:19:31+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/vm:proxmox:kvm:spice?rev=1600888771&do=diff SPICE apt -y install virt-viewer On guest install spice-guest-tools-latest.exe Issues undefined symbol: libusb_set_option virt-viewer: symbol lookup error: /usr/lib/x86_64-linux-gnu/libusbredirhost.so.1: undefined symbol: libusb_set_option Downgrade libusbredirhost1 to version text/html 2026-02-03T10:40:36+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/vm:proxmox:kvm:virtio_drivers?rev=1770115236&do=diff virtio drivers download <https://fedorapeople.org/groups/virt/virtio-win/direct-downloads/archive-virtio/> Latest versions: * Windows 7: virtio-win-0.1.173.iso * Windows 8: ??? virtio-win-0.1.190.iso * Windows 10: devices Most common absolute minimum for Windows: * PCI Device VEN_1AF4 DEV_1002 * VirtIO Balloon Driver Balloon\w10\amd64 * PCI Simple Communications Controller text/html 2025-01-09T07:35:48+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/vm:proxmox:kvm:windows?rev=1736408148&do=diff Windows Guests * Windows 10 guest best practices * Windows VirtIO Drivers * Migration of servers to Proxmox VE NOTE: QEMU guest agent requires also virtio-serial Win7 * WIN7: do not enable KVM storage cache. Writeback cache slows down everything. Tuning Guest * Performance Tweaks * Use kvm64 CPU: Windows VM insanely slow * mitigations) * Do not enable any caching on storage devices, it slows down everything!