Bug#1110878: Kernel module MD_LINEAR is absent in debian trixie default kernel.
Hi,
On Tue, Aug 12, 2025 at 09:59:33PM +0300, Good Grief wrote:
> Hello.
>
> We are using the next disk setup on some of our servers:
> mdadm raid (concatenation (16Tb x4) and mirror (16Tb x2) ) -> cryptsetup ->
> lvm in each of them.
> After updating debian to trixie on one of those servers I've noticed that
> mdadm raid1(mirror) md-s worked well but I could not decrypt md-s that use
> the md_linear kernel module.
> Luckily, I don't have the root partition on those raids (It is located on
> an additional separated ssd disk) and the servers can start successfully.
> So at this moment I've reverted to kernel 6.1(from bookworm debian version)
> to restore the data storage functionality and trying to find the solution
> for data migration from mdadm to dmraid or maybe lvm or something else.
> After quick googling I think dmraid (dm-linear can cover my case / can
> create disk concatenations, but I still need to migrate a lot of data to
> the new raid structure %( ).
> (Earlier I thought that mdadm won dmraid in "software raid battles .... ").
Sorry for the late followup. I will close the issue then, as we aim
not to re-enable it given it should be for good deprecated.
I just want to make one comment: I really meant device mapper linear
target, not dmraid.
dmraid is gone, it should not be used anymore, so please don't look
for solutions involving dmraid (but maybe we just got naming
missunderstandings here).
FWIW, cf. https://bugs.debian.org/1056944
Regards,
Salvatore
Reply to: