Bug#841423: LVM: raid1 kernel module not loaded

Ben Hutchings ben at decadent.org.uk
Thu Oct 20 22:54:09 UTC 2016

On Fri, 2016-10-21 at 00:17 +0200, Cesare Leonardi wrote:
> Here i've talked about raid1 because it is what i've tested myself, but 
> since LVM can handle raid0/1/4/5/6/10, perhaps the same arguments apply 
> also to the other raid types.
> For example i've noticed that the initramfs' hook from mdadm takes care 
> of loading all the raid modules:
> -------------------------------
> for module in linear multipath raid0 raid1 raid456 raid5 raid6 raid10; do
> 	force_load $module
> done

It should really use manual_add_modules to ensure the modules are
included in the initramfs.  It should not force them to be loaded.

> -------------------------------
> Maybe should also lvm2's hook load those modules?

Either dmsetup or lvm2 (I'm not quite sure what the division of
responsibilities is there) should ensure they are included.


> And in fact if both lvm2 and mdadm are installed, what i'm reporting 
> here doesn't happen: raid modules are loaded by mdadm's hook.
> Moreover, if i understand correctly, the grub2 package uploaded to 
> unstable 4 days ago (2.02-beta3) is the first that supports booting from 
> an LVM raid1: it would be wonderful if that setup could be supported out 
> of the box in Debian.
Ben Hutchings
Never put off till tomorrow what you can avoid all together.

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