Re: [gentoo-user] Fun with mdadm (Software RAID)

[Alan Mackenzie <acm@muc.de>]

Hello again, Karl.

On Sat, Dec 21, 2024 at 12:43:50 +0000, Alan Mackenzie wrote:
> On Fri, Dec 20, 2024 at 23:02:58 +0100, karl@aspodata.se wrote:
> > Alan Mackenzie:
> > > On Fri, Dec 20, 2024 at 18:44:53 +0100, karl@aspodata.se wrote:
> > ...
> > > > Please tell if you make booting with metadata 1.2 work.
> > > > I havn't tested that.

> > > I've just tried it, with metadata 1.2, and it doesn't work.  I got error
> > > messages at boot up to the effect that the component partitions were
> > > lacking valid version 0.0 super blocks.

> > > People without initramfs appear not to be in the sights of the
> > > maintainers of this software.  They could so easily have made the
> > > assembly of metadata 1.2 components on the kernel command line work.
> > > :-(
> > ...

I've now got working code which assembles a metadata 1.2 RAID array at
boot time.  The syntax needed on the command line is, again,

    md=124,1.2,/dev/nvme0n1p6,/dev/nvme1n1p6

..  In place of 1.2 can be any of 0.90, 1.0, 1.1, though I haven't tested
it with anything but 1.2 as yet.

> The pertinent functions are mainly in drivers/md/md-autodetect.c and
> md.c (same directory).

Actually, just in md-autodetect.c.

[ .... ]

> Nevertheless, I might make the above enhancement, just because.

Done.

> > Regards,
> > /Karl Hammar

-- 
Alan Mackenzie (Nuremberg, Germany).