[systemd-devel] "bootctl install" on mdadm raid 1 fails

[Michael Chapman]

On Sun, 10 Dec 2017, Bjørn Forsman wrote:
> On 9 December 2017 at 06:56, Andrei Borzenkov <arvidjaar at gmail.com> wrote:
>> [...]
>> Firmware is unaware of MD RAID and each partition is individually and
>> independently writable by firmware.
>
> 1. "Firmware is unaware of MD RAID". I agree.
> 2. "... independently writable by firmware". I don't expect firmware
> to _write_ to the ESP (does it?!). As long as it only reads, nothing
> will get out of sync.

It's perhaps unlikely for firmware itself to write to the ESP, but 
certainly anything launched from the firmware can. One of my boot entries 
is an EFI shell, and it can move, copy, read and write files within the 
ESP.

I think it's probably wise to avoid software RAID for the ESP.