June 18, 2025 - Now that this is all set and created, we go to the PROXMOX WEBUI Navigate to: [Datacenter] --> [Directory Mappings] this is near the bottom of that panel and NOT storage where you can set directories (to avoid confusion) At the top click the [Add] button Give your share Name (Also known as a TAG - which is how you refer to it inside the Guest) and set the path my eg: Name: HYPERSHARE Path: /hyper1/hypershare and click [Create] NOW CLICK ON YOUR GUEST --> [Hardware] The click [Add] the dropdown at the bottom will have Virtiofs, click on that to add it. You can then click on the Directory ID and select your newly create Directory(TAG) and tick needed Attribute boxes as appropriate to your setup, mine i tick all three, then click [Add] Now last thing to do quickly is install the extended ACL tools on proxmox, go to the SHELL(CONSOLE) and install it with:

January 14, 2025 - I would like to passthrough a host directory to VMs. I would like to use VirtIO-FS for this. Unfortunately, the option is not available under Hardware in the web interface. And when I try to install (apt install qemu-system), it conflicts with (pve-qemu-kvm). How can I install and set up VirtIO-FS?

July 12, 2023 - To start manually, use: /usr/libexec/virtiofsd --syslog --socket-path /run/changeme.sock --shared-dir /dir/to/share/with/vm --announce-submounts --inode-file-handles=mandatory Substitue: changeme.sock with the name used in args: in step (1) /dir/to/share/with/vm with the underlying host directory exposed to the VM Instead of "--syslog", use "--log-level debug" to troubleshoot.

5 days ago - # mount -t virtiofs $passthrough-name /mnt/virtiofs Out of curiosity, I ran dd against the captured image file to see how well virtiofs performed with reads, and observed ~550 MB/s: # dd if=sda3.ntfs-ptcl-img.zst.aa of=/dev/null -status=progress 3874079232 bytes (3.9 GB, 3.6 GiB) copied, 7.00021 s, 553 MB/s ^C To account for Guest OS filesystem caching to memory, I completely unmounted and remounted the virtiofs assthrough and received the same results. I perform the same read on the host, and it hits a ceiling of ~150 MB/s: # dd if=sda3.ntfs-ptcl-img.zst.aa of=/dev/null -status=progress 70162

April 9, 2025 - I am still using cache=auto, which I have set up half a year ago with hook scripts. Compared to always, auto loses about 21% performance, using OP's fio command. If NFS has no issues for you, then I don't see any reasons to migrate as you won't get better performance with virtiofs.

It's installed as a separate package called "virtiofsd" in PVE 8, whereas a different...

August 21, 2025 - With the release of Proxmox VE 8.4, users gained the ability to create host-level shared directories, allowing direct access host files from virtual machines (similar to shared folders in VMware Workstation). VMs can access shared directories (files) on the Proxmox host directly, without going through the network, using the VirtIOFS file system.

args: -chardev socket,id=char0,path=/run/qemu-server/101-media.virtiofsd -device vhost-user-fs-pci,queue-size=1024,chardev=char0,tag=/media -object memory-backend-file,id=mem,size=4G,mem-path=/dev/shm,share=on -numa node,memdev=mem

April 13, 2025 - In all honesty, at this stage of development I would say virtiofs is more a technology preview then an actually useful tool, especially in light of its poor performance. Click to expand... I agree its a preview in proxmox - as i alluded to in my opening post Virtiofsd absolutely supports qemu snapshots based on the documentation - as it clearly states the virtiofsd managed storage is NOT snapshotted and should not be included in the snapshot - you will note I didn't ask for it to be.

Proxmox VE is a platform to run virtual machines and containers. It is based on Debian Linux, and completely open source. For maximum flexibility, we implemented two virtualization technologies - Kernel-based Virtual Machine (KVM) and container-based virtualization (LXC) · One main design ...

virtiofsd is used to "passthrough" parts of a host filesystem to a virtual machine with "local filesystem symantics and performance". Proxmox moved to a rust based version of virtiofsd in PVE 8 located here.

April 15, 2025 - Thomas Lamprecht explained this ... virtiofs, the VirtIO file system, VMs under Proxmox VE 8.4 can access parts of the host file system directly without the detour via a network protocol....

May 5, 2025 - Learn how to access a Proxmox host folder from a Windows VM using Virtiofs. This guide explains the setup process for folder sharing

April 9, 2025 - Virtiofs directory passthrough: ... is achieved through the use of virtiofs, which allows VM guests to access host files and directories without the overhead of a network ......

Virtiofs is a shared file system that lets virtual machines access a directory tree on the host.