Shutdown the host properly and report if those VM boots. Try to disable/enable power on via Xen Orchestra, there's an issue in XCP-ng Center with this setting.

RTFM https://xcp-ng.org/docs/compute.html#pci-passthrough You can also passtrough multiple devices. If you wanted to passtrough another device at 00:19.0 just append it to the parameter. [root@xen ~]# xe vm-param-set other-config:pci=0/0000:04:01.0,0/0000:00:19.0 uuid=<vm uuid>

@xTITUS-MAXIMUSx Thanks for the tip. I went to the bios and enabled the Intel Virtualization Technology and I thought I was done. After further research I recognized there are two steps to Enable the Intel Virtualization Technology. https://us.informatiweb.net/tutorials/it/bios/enable-iommu-or-vt-d-in-your-bios.html Advanced >> CPU configuration >> Intel Virtualization Technology >> Enable Advanced >> System Agent Configuration >> VT-d >> Enable

It seems I got a kernel panic for some other reason with 5.4.21. It's all working now, thanks.

Please take time to read carefully the previous link I send. If you can't spot it, re-read it slowly, you might see this link: https://xenbits.xen.org/docs/unstable/support-matrix.html

It should work, yes.

Hi @mauricio_hps This is a XCP-ng forum, please try with XCP-ng https://xcp-ng.org

@talbaror by the way you can find discussion about all this, and what users have tried, etc., at: https://xcp-ng.org/forum/topic/2496/xcp-ng-nfs-timeout-values-and-storage-node-active-standby-failover https://github.com/xcp-ng/xcp/issues/334

5% sounds too much for me, but I'll check it in some populated pools (with host's cpu below 80%) to have a better idea.

@Otis2772 Where is your time synchronization coming from? Time differences can be caused by a slew of things including power settings (VM or not), CPU availability, networking connectivity, etc. Are they all the same OS or different OSes?

64 hosts tops. But in general, people tends to use around 16 to 20 hosts max in a pool. Don't forget about support

Check dmesg in the VM

I am back to the office and I am troubleshooting different settings and connection setups. I appreciate all your input. The issue is configuring the right NIC0/NIC1/WAN/ and LAN. Once I am done I post my setting. Thanks again for everyone.

Wow, didn't know it was possible to violate those rules!

Yep.. that did it... started it on the older host, and can now migrate it backwards and forwards with on issues... Thanks Olive... as always. Peter.

@r1 @olivierlambert Hello! There is nothing in any logs at all, on either the Dom_0 or Dom_U at the time of the crash, the journal on the Dom_U stops updating at the instant of the freeze and only resumes after it has been destroyed and re-started. We are in the process of moving sites to HVM, that is an ongoing part of our plan, 1 down... We've not tried running a screen session, but that is a very good idea, and we'll do that - thanks! I don't believe we've tried running in debug mode either, so will pursue that too. Thanks for the advice, I appreciate it - I know it isn't anything even remotely related to your work, but as an XCP-ng user personally, I wasn't sure where else to try. Thanks, Mark

Also you might use http://irqbalance.github.io/irqbalance/ to help "spreading" the load on various CPUs.

In XO: Advanced tab of the VM. Enable nested virt, then boot the VM. That's it!

In FreeNAS. exports file you should have fsid=123, with a unique number for each exported path. If not it can cause a problem if the nfs server is rebooted while the pool is up. https://linux.die.net/man/5/exports https://www.suse.com/support/kb/doc/?id=000017897 The stale mounts are in xcp-ng. But this is just a theory. During the power outage. Did all xcp-ng hosts and the FreeNAS as boxes go down? How did you boot up? You wrote you set up fresh servers?

Okay, this makes sense, thank you for the clarification. The reason I was asking I've been having crazy issues with xcp-ng on my server with VMs crashing all the time on boot etc and have been trying to troubleshoot and just wanted to look into this as I've done every other thing I can possibly think of. thanks again!