Comment 3 for bug 1523779

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Scott Moser (smoser) wrote : Re: [1.9rc3] grub-install error on power8 deployment

OK. So the summary of what is wrong here, is that MAAS provided invalid storage data.
The storage config sent is below (I did trim out some duplicate and unused devices).
MAAS said to install grub onto /dev/sda. On power systems the grub that is installed is grub-ieee1275. grub-ieee1275 requires a 8M PrEP partition. Since maas did not provide one, the installation of grub failed.

On powerNV, the bootloader that is actually used is petitboot, so grub is not even strictly necessary. I'm not sure if petitboot supports reading grub config from lvm volumes or not. That said, guests in KVM on power systems or powerVM systems *do* need grub. previously, 'curtin block-mode simple' would configure all power systems by creating a 8M PrEP partition and installing grub to that.

I've got a storage config to successfully install, I'll attach here the one that maas sent and the modified version that worked.