Re: grub2 mdadm and default_layout , attempt to read or write outside of disk

[Pascal Hambourg]

Le 04/06/2022 à 16:07, Andrei Borzenkov a écrit :
> On 04.06.2022 14:25, Darko Luketic wrote:
> > A loss of the rootfs would be catastrophic

How could a loss of anything on RAID0 be catastrophic ?

> > My guess is grub can't deal with mdadm's layout-original or
> > layout-alternate or layout-unspecified.
>
> Currently grub does not support RAID0 with different member disk sizes
> which makes RAID0 layout irrelevant at all for now.

Good to know, thanks, even though I do not plan to have /boot on RAID0 
anytime soon (rather on RAID1).

> Implementation looks more or less straightforward. Instead of using one
> single RAID0 segment for the whole array grub should build a list of
> segments if raid disks are of different sizes. And of course adjust
> mapping between logical and physical sectors depending on current layout.

Also note that RAID0 layout is irrelevant when only one member is bigger 
than the other(s).