Re: Transferring an existing system from non-RAID disks to RAID1 disks in the same computer

[Wols Lists <antlists@youngman.org.uk>]

On 21/01/2023 14:33, Pascal Hambourg wrote:
> On 21/01/2023 at 15:04, Wols Lists wrote:
>> On 21/01/2023 13:32, Pascal Hambourg wrote:
>>> Back on topic, if you mean Windows+Linux dual boot, it seems unlikely 
>>> to me that this can be achieved with Linux software RAID, because 
>>> Windows does not support it and Windows software RAID usually works 
>>> on whole drives.
>>> If you mean Linux dual-boot, you do not need multiple boot loaders, 
>>> one single boot loader can boot all Linux systems.
>>
>> Given that this all started with *MIRRORING* EFI partitions, I think 
>> you've lost the thread ...
>>
>> I'm fully in agreement that - if we want to keep our EFI partitions in 
>> sync - then doing so when the partition is updated is the best TIME 
>> (not place) to do it. (Which is why mirroring makes sense.)
>>
>> It's just that - as soon as you bring multiple OSes (of any sort) into 
>> it - this ceases to be a practical solution.
> 
> It depends if you mean "mirroring" with rsync or with RAID.
> Also, it depends what the OS sorts are. With only Linux systems all 
> using EFI partitions in RAID1, it might work.
> 
>> THERE'S TOO MANY WAYS TO SKIN THIS CAT and trying to automate it will 
>> in almost all cases lead to tears :-(
> 
> This is why I claim that the only universal solution is that each OS 
> supports multiple EFI partitions natively when writing any file in an 
> EFI partition. Mirroring is a dead end.

Is that one EFI per OS, or multiple identical EFI? :-)

There's too many ways to skin this cat ...

Cheers,
Wol