Am 22.01.23 um 10:04 schrieb Pascal Hambourg:

On 21/01/2023 at 23:56, Reindl Harald wrote:

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Am 21.01.23 um 23:43 schrieb Pascal Hambourg:

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RAID provides redundancy while the system is running 

RAID provides redundancy for devices - no matter if something is running

RAID alone does not provide boot redundancy.
If a drive fails, the system will continue to run until shutdown. But it 
won't boot if the boot area was only set up on the failed disk

what's the point of such nonsense-comments?

yes, when i am an idiot an don't run grub2-install on all disks it#s no 
there - but as saif dozens of times: we all know this and it has to be 
only done ONCE per drive

after that RAID ensures (ensured before UEFI) that /boot and everything 
in that filesystem is redundant

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For boot redundancy, the boot loader must be installed on each disk

so what

So that the system can still boot after whichever drive failed.

"so what" meant "tell me something we didn't know before you where born"

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With EFI boot, it means there must be an EFI partition on each disk. 
But EFI partitions do not need to be identical as long as any of them 
can boot the system

so what - the topic is "Transferring an existing system from non-RAID 
disks to RAID1 disks in the same computer"

People who install the system on RAID usually expect boot redundancy

and i explained multiple times how to get that with ESP