File Sync isn't occuring from unraid desk unless "ls -l" on Virtual Machine VirtioFs

Hi everyone,

I set up a little test scenario below that illustrates the symptoms of what I am experiencing,

So I have the following criteria

• Virtiofs Mode for "/mnt/user/Backup/Logs/" => "logs"
• fstab entry of "logs /mnt/logs virtiofs ro,relatime,sync 0 0"
• Full rwe on the test file

I executed the commands back and forth from left to right.

1. root "ls -l" to display the current directory on unraid os
2. alexander "ls -l" to display current directory on the virtual machine
3. root "cat testfile" to display the content of the file on unraid
4. alexander "cat testfile" to display the content of the file on the virtual machine
5. root "sudo nano testfile" and append a string in nano
6. root "cat testfile" to display the new content after nano modify
7. alexander "cat testfile" still has the old content of the file
8. alexander "ls -l" which relists the directory and refreshes some cache
9. alexander "cat testfile" now has the new content from unraid drive.

I have tried this routine numerous times and it seems to always to have the old file until I do "ls -l" or some background process that I am not aware of refreshes the file. So far the only thing that will for sure refresh the file is "ls -l", I could consistently "cat testfile" for 10+ runs and it won't change until a "ls -l" was ran, then it changed instantly.

One of the things that I thought might be an issue was if the share was on a cache pool, but upon checking it is disabled for my "Backup" share.

Any help would be greatly appreciated!! Thank you!