Ran ./test on mdadm source before running raid6check. Now array is borked.

Ran ./test on mdadm source before running raid6check. Now array is borked.

[David Niklas]

Hello,
I managed to find the raid6check utility here:
https://salsa.debian.org/debian/mdadm

I downloaded and compiled the code, ran mdadm --stop on my array, and
ran ./test . Many of the tests failed, but more concerning is that I
cannot restart my array.

# mdadm --verbose --assemble /dev/md0
mdadm: looking for devices for /dev/md0
mdadm: /dev/sda has wrong uuid.
mdadm: No super block found on /dev/sdb (Expected magic a92b4efc, got
00000000) mdadm: no RAID superblock on /dev/sdb
mdadm: No super block found on /dev/sdc (Expected magic a92b4efc, got
00000000) mdadm: no RAID superblock on /dev/sdc
mdadm: No super block found on /dev/sdd (Expected magic a92b4efc, got
00000000) mdadm: no RAID superblock on /dev/sdd
mdadm: No super block found on /dev/sde (Expected magic a92b4efc, got
00000000) mdadm: no RAID superblock on /dev/sde

What do I do now?
If the test utility is so dangerous, why is there no warning to pull your
HDDs before you run ./test? Like, make test normally doesn't bork
anything.

Thanks!

Re: Ran ./test on mdadm source before running raid6check. Now array is borked.

[simd]

Hello,
I think I found out my problem. I have some backup drives in my system,
to backup my data to. For some reason, an AiC I use for my HDDs failed to
post. Therefore, the drives I'm looking at are mostly the backup drives.
Hence why there are are "00000000".

Thanks guys!

On Mon, 4 Aug 2025 22:21:02 -0400
simd@vfemail.net wrote:
> Hello,
> I managed to find the raid6check utility here:
> https://salsa.debian.org/debian/mdadm
> 
> I downloaded and compiled the code, ran mdadm --stop on my array, and
> ran ./test . Many of the tests failed, but more concerning is that I
> cannot restart my array.
> 
> # mdadm --verbose --assemble /dev/md0
> mdadm: looking for devices for /dev/md0
> mdadm: /dev/sda has wrong uuid.
> mdadm: No super block found on /dev/sdb (Expected magic a92b4efc, got
> 00000000) mdadm: no RAID superblock on /dev/sdb
> mdadm: No super block found on /dev/sdc (Expected magic a92b4efc, got
> 00000000) mdadm: no RAID superblock on /dev/sdc
> mdadm: No super block found on /dev/sdd (Expected magic a92b4efc, got
> 00000000) mdadm: no RAID superblock on /dev/sdd
> mdadm: No super block found on /dev/sde (Expected magic a92b4efc, got
> 00000000) mdadm: no RAID superblock on /dev/sde
> 
> What do I do now?
> If the test utility is so dangerous, why is there no warning to pull
> your HDDs before you run ./test? Like, make test normally doesn't bork
> anything.
> 
> Thanks!
>