Re: Corrupted RAID 1

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

On 18/07/2023 10:25, Yu Kuai wrote:
> Hi,
> 
> 在 2023/07/14 4:58, Leslie Rhorer 写道:
>>      I have a corrupted bootable RAID 1 array on a pair of SDD drives, 
>> and I fear I need some assistance.  Actually, there are four 
>> partitions on each drive, and two RAID 1 arrays were assembled from 
>> each drive. When working properly, the second pair of partitions were 
>> mounted as / and the first pair were mounted as /boot.  The OS is 
>> Debian Buster. When I attempt to boot the system, it goes directly to 
>> the GRUB prompt.
>>
>>      I pulled the drives and attached them to an active system.  Mdadm 
>> reports both partition tables to be intact with partition labels of 
>> fd, 83, ef, and 82, respectively and MBR magic of aa55.  When I try to 
>> assemble any array says the partitions exist but are not md arrays.
>>
>>      Fdisk reports the partition types as Linux raid autodetect, 
>> Linux, EFI, and Linux swap / Solaris.  The EFI partitions are marked 
>> bootable and contain the following:
>>
>> total 3472
>> -rwxr-xr-x 1 root root     108 May 28  2022 BOOTX64.CSV
>> -rwxr-xr-x 1 root root   84648 May 28  2022 fbx64.efi
>> -rwxr-xr-x 1 root root     152 May 28  2022 grub.cfg
>> -rwxr-xr-x 1 root root 1672576 May 28  2022 grubx64.efi
>> -rwxr-xr-x 1 root root  845480 May 28  2022 mmx64.efi
>> -rwxr-xr-x 1 root root  934240 May 28  2022 shimx64.efi
>>
>>      Any suggestions?  I should say that the running system
>> (Bullseye) is not the same version as the failed one (Buster).  Of 
>> course the failed system does need to be upgraded, but there are 
>> specific reasons why this is quite undesirable at this point.
>> .
> 
> There really is not enough information, what is the kernel version?
> And in the active system, what mdadm cmds you're using and what's the
> result? (And please show us the result of mdadm -E /dev/[partition]).
> 
@kuai

Point them at the wiki ...

https://raid.wiki.kernel.org/index.php/Linux_Raid#When_Things_Go_Wrogn

Cheers,
Wol