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mdadm for Debian - initramfs transition
=======================================
None of the following needs to concern you if you are using monolithic kernels
(no modules), yaird, or initrd-tools/mkinitrd.
This information is about #367567. The gist is that the hooks and scripts to
take care of RAID during boot with an initramfs have been improved and moved
into the mdadm package. mdrun has been deprecated on the way.
As long as the version of initramfs-tools you have installed still provides
the old hooks and scripts (which use mdrun), the new ones will simply not do
anything (which allows me to get rid of the conflict I needed previously).
Version 0.70 and later does not provide these hooks anymore, so the new mdadm
hooks will be used, which use mdadm instead of mdrun.
initramfs-tools does *not* conflict with older mdadm but instead provides
fallback code in case mdadm << 2.5-1 is installed (which does not provide the
hooks yet). This decision was made in order to prevent the slight chance that
mdadm would be removed due to the conflict. See #380089.
Unless I've overlooked a detail, no interaction is required from the side of
the user (apart from the new debconf question) to install and get mdadm
running and integrated with initramfs-tools. It helps to ensure that
update-initramfs produces output that squares with your own perception of what
is needed to boot, and that the output of the script /usr/share/mdadm/mkconf
is sane after installation and before you reboot.
Also, you may want to provide yourself a safety net by making a copy of the
initrd:
cp /boot/initrd.img-$(uname -r) /boot/initrd.img-$(uname -r).before-mdadm25
and then to duplicate your main grub or lilo stanzas (rerun lilo!) and point
them to the saved initrd. If things go haywire, you should be able to restore
a working condition with the saved initrd.
If you want to move to the new hooks and scripts without installing
initramfs-tools 0.70, do this:
rm /usr/share/initramfs-tools/hooks/md
sed -i -e 's,^PREREQ=\"md\"$,PREREQ=\"mdadm\",' \
/usr/share/initramfs-tools/scripts/local-top/lvm
update-initramfs -u -k all
If update-initramfs says something about initrd having been altered and
refuses to do something, use -t unless you modified the initrd on purpose and
don't want it overwritten.
Again, please report success or failure to me.
-- martin f. krafft <madduck@debian.org> Mon, 31 Jul 2006 14:32:21 +0100
$Id$
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