VMs fail to boot after FreeNAS restart

[AnimeAi]

I've got a strange problem where following a reboot of the FreeNAS box all my VMs fail. This has happened twice so far.

Steps taken:

1. Create 6 VMs with UEFI boot method and autostart.
2. Edit devices to include: VNC, NIC, CD ISO Image, 2 cores, RAM (512MB - 8096MB) and zvol (25GB - 100GB on two drive pools)
3. Install CentOS Minimal (latest)
4. Set up static IP networking during install
5. Reboot VM following install

Reboots of each VM from within the VM work fine at this point.
Reboots of each VM from within the FreeNAS UI work fine at this point.

Following a reboot of the FreeNAS host (once as a manual reboot, once as an upgrade from 11.1 U3 to 11.1 U4 the VMs will all either boot to the CentOS installer (if the ISO image is still attached as a device) or to the UEFI boot manager.

UEFI manager sees the zvol https://snag.gy/RcsiNf.jpg

The data on the zvol is still in place and unaltered the machine will simply not boot from it or read it from the UEFI boot manager. Suggestions would be appreciated as I have no idea where to start looking to fix this. Ideally I need FreeNAS to work as a hypervisor so I can retire two smaller PCs and save on the electric bill.

System Spec:
Hostname freenas.local
Build FreeNAS-11.1-U4
Platform Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz
Memory 32560MB
System Time Sun, 8 Apr 2018 04:19:12 -0700
Uptime 4:19AM up 3 days, 12:43, 0 users
Load Average 0.65, 0.58, 0.74
Storage Two RaidZ1 pools (4x4TB 69% full, 4x3TB 50% full) with seperate 32GB boot ssd drive/pool

 

[Stux]

So, what about shutting down the vm and then starting it, does that work?

Suspect you need to copy the grub loader to the expected place.

 

[AnimeAi]

No idea because I've lost over 12 hours of setup each time this has happened.

Grub isn't even attempting to load it goes straight to the UEFI Manager https://snag.gy/h5qwz7.jpg

 

[Stux]

No idea because I've lost over 12 hours of setup each time this has happened.

Grub isn't even attempting to load it goes straight to the UEFI Manager https://snag.gy/h5qwz7.jpg

Exactly.

https://forums.freenas.org/index.php?threads/howto-how-to-boot-linux-vms-using-uefi.54039/

 

[AnimeAi]

Exactly.

https://forums.freenas.org/index.php?threads/howto-how-to-boot-linux-vms-using-uefi.54039/

Ahhh thanks for that link I've got one of them booted now so I should be good from here! Much appreciated.