Anders Kaseorg (anders-kaseorg), thanks for the links. Really, it's more
safe not implementing LVM write support instead of accepting a risk.

And about the RAID write support? Are there any considerations about?

Well, I had a different idea (but a complex idea) about the write
support: users maybe want to install /boot in a RAID to have redundancy
when a disk fails.

And if does grub mount a small external partition only to save the
contents of the grubenv? This partition could uses the same ideia of the
BIOS Boot partition, marked with a bios_grub flag (this partition would
had a flag like save_grubenv). So, when a disk fails, the only lost data
would be the grubenv, saved locally in that disk.

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https://bugs.launchpad.net/bugs/1274320

Title:
  Error: diskfilter writes are not supported

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