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To close out my issue reported above, it ended up being my Mikrotik router which has insufficient packet buffering at the interface hardware level. I implemented flow control between the router and switch which has helped significantly with packet drops.

I've also just started noticing this. Iperf3 has very high retries when transiting between VMs in different VLANs, meaning traffic leaving a VM in VLAN1 out to the router and back into a VM in VLAN2 has very high retry. All VMs are debian based and using Virtio drivers. Iperf3 between VMs in...

Awesome, glad to hear it's working!

Definitely give it a try. As long as you see that ctrl C option for the HBA BIOS when you boot the TrueNAS VM the passthrough itself should be working. If you don't get that far it may be something else.

Thanks all for the advice, my HBA passthrough stopped working post kernel reboot. Rolling back to 5.13.19-3-pve is working fine.

Okay so it sounds like you'd be going from Storage Spaces to ZFS. The only benchmark comparison I could find was this one that shows on some workflows ZFS is much faster than SS.

In your current server config, are you using an onboard consumer RAID controller to achieve raid5? This may be part of the problem if it doesn't have a a proper cache built in. This could cause high IO delay. This would be solved by running HBA -> ZFS with a large amount of RAM. I just got...

I mean how long are you waiting for the TrueNAS vm to boot? I assume that is what is getting "stuck" Do you have a screenshot of what you see on the vm console when it is stuck? On my LSI card I hit "Ctrl C" when prompted during the VM boot to access the card bios. Also, now that I'm...

https://forum.proxmox.com/threads/vm-not-starting-after-upgrading-kernel-and-reboot-timeout-waiting-on-systemd.104292/post-449049 This gentleman has provided a guide for how to change to the old kernel permanently by editing the GRUB files. I have not tried this myself.

How long are you waiting for it to boot? My LSI 9207 would take upwards of 2 to 3 full minutes to initialize while booting my TrueNAS VM. Once I disabled the boot function on the LSI card BIOS it takes about 30 seconds.

Same problem here. For the time being I have used GRUB bootloader to boot into kernel 5.13.19-3-pve and all is well.

Can you access shell on the proxmox node and issue command "pveversion"? The latest kernel (5.13.19-4-pve) seems to be breaking PCI passthrough. If you are running 5.13.19-4-pve, try booting to an older kernel from the GRUB boot menu. 5.13.19-3-pve is working fine for me.

Confirmed latest kernel broke my TrueNAS HBA card PCI passthrough, booted back into 5.13.19-3-pve and all is well.