VM with ZFS raw disks over iSCSI does not boot due to missing extents in TrueNAS

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Hello community.

I have a small environment of two Proxmox VE nodes pve-manager/7.2-7/d0dd0e85 (running kernel: 5.15.39-1-pve) + 1 TrueNAS storage (TrueNAS-12.0-U8.1 with freenas plugin 2.2.0-0 -beta1 from theGrandWazoo). I store my VMs using ZFS over iSCSI, and backup them using NFS.

Until a few days ago, everything was perfect. But one day, after a power outage, the TrueNAS server went "unconfigured" (maybe because I didn't save the configuration, but that doesn't matter) and most of the iSCSI extents are no longer listed, although the raw disks of the VMs are still there, intact.

Of course, this causes some VMs to start without problems, but others (those that do not have their corresponding extents in TrueNAS) do not, indicating with the error message:

TASK ERROR: Could not find lu_name for zvol vm-1020-disk-0 at /usr/share/perl5/PVE/Storage/ZFSPlugin.pm line 118.

On TrueNAS, I can verify that there is no iSCSI extent for that VM, and I guess that is the cause of the problem. Because for the VMs that are listed, they can boot:




So, I decide to add an extent manually, indicating the corresponding device, for example:




Nice, now I have everything in order, I try to start the VM:




But the VM startup still fails...


So what am I missing? How do I link / edit the disk with its corresponding extent?

Now, to fix this, I'm creating new VMs with disks stored on TrueNAS via ZFS over iSCSI, and then from TrueNAS dd if=original_vm_image_disk of=new_vm_image_disk
but this takes a lot of time, and I'm sure there is a better way.

Any help will be appreciated.

Regards!

 

[LnxBil]

Now, to fix this, I'm creating new VMs with disks stored on TrueNAS via ZFS over iSCSI, and then from TrueNAS dd if=original_vm_image_disk of=new_vm_image_disk
but this takes a lot of time, and I'm sure there is a better way.

One way would be to create every disk new (exact! size) and just rename the underlying zvols on your TrueNAS server.