One interesting thing about Grub and ZFS with large dnodes is that the same author who had previously added support for various ZFS features in Grub sent a patch in 2017 (Experimental!) and also asked for help in testing his implementation.
https://lists.gnu.org/archive/html/grub-devel/2017-09/msg00049.html
I found the thread recently and intended to try it out but could not get Grub to compile normally on a Proxmox system during my initial testing, not a problem related to the patch. I found it easier to just reinstall with large dnode feature disabled on that particular system.
https://lists.gnu.org/archive/html/grub-devel/2017-09/msg00049.html
I found the thread recently and intended to try it out but could not get Grub to compile normally on a Proxmox system during my initial testing, not a problem related to the patch. I found it easier to just reinstall with large dnode feature disabled on that particular system.