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mdadm for Debian - EXPERIMENTAL RELEASE
---------------------------------------
THIS IS AN EXPERIMENTAL RELEASE. DO NOT EVEN THINK ABOUT RUNNING IT ON
PRODUCTION SERVERS. or at least don't blame me for it afterwards.
None of the following needs to concern you if you are using monolithic kernels
(no modules), yaird, or initrd-tools/mkinitrd.
I will leave this version in experimental, until enough success reports have
reached me at madduck@debian.org (and no failures). Thus, please report your
experience to me.
This version of mdadm basically addresses #367567 (but also provides a new
upstream release, of course). 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 initramfs-tools 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). Once initramfs-tools removes the md
hooks from the package, the new mdadm hooks will configure the initramfs to
use mdadm for assembly (and not mdrun).
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 immediately (without waiting
for #367567 to be solved), do this:
rm /usr/share/initramfs-tools/hooks/md
sed -i -e 's,^PREREQ=\"md\"$,PREREQ=\"mdadm\",' \
/usr/share/initramfs-tools/scripts/local-top/lvm
update-initramfs -u -k$(uname -r)
(that -k is due to #375671. 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> Thu, 29 Jun 2006 01:07:09 +0200
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