In FAI, we cannot easily determine which mke2fs or grub version will be used in the target system since we support deb and rpm based and other linux distributions.
As I did with the older issues of mke2fs (metadata_csum) I will add a comment, so the user can decide if he needs to add the option -O ^metadata_csum_seed In FAI this has to be done in the config examples (which goes into the package fai-doc), not in the code itself. I therefore decrease the severity to normal. -- regards Thomas