On Sun, Sep 07, 2008 at 11:41:36PM +0200, Jonas Meurer wrote: > Hello, > > I upgraded one of my servers to debian/lenny recently, and unfortunately > I forgot to remove the apt pinning for mdadm from /etc/apt/preferences, > so an old mdadm from backports.org was kept installed, while the rest of > the system was updated to debian/lenny. this lead to a broken initramfs, > and the server didn't boot any more. > > The server has two 500gb disks in software raid (md0 = swap, md1 = root). > > after some (helpful) conversation with waldi from the debian-kernel > team I found out what the reason was (see bug #498029), upgraded mdadm > to latest version after booting with /dev/sda2 as root instead of > /dev/md1. after recreating the initramfs the system indeed booted again > with software raid enabled, but now the filesystem on /dev/md1 seemed > corruped. fsck failed in the boot process and i had to run it manually, > but that didn't fix all issues either, instead fsck repeated to start > from beginning infinitely. > > so I stopped that, configured the system to again use only /dev/sda2 as > rootfs and booted. but somehow things got mixed up: /var/lib/dpkg/status > is missing, some parts of it are found in > /var/lib/dpkg/info/molly-guard.conffiles instead etc. in short, the fs > seems to be mixed up. > > Currently I'm running 'fsck -y /dev/sdb2', and hopefully that system > isn't mixed up as bad as /dev/sda2 is. > > anyway, once I managed to restore one of the two filesystems, how can I > start the raid again? how do I tell mdadm which one is the correct and > up-to-date device, and which one needs to be synced? > or is it even possible to automaticly restore the full filesystem from > the two raid devices? Can I suggest the first thing to do is backup and then backup. it is possible to build a raid set with a filed drive, sounds like this is what you need to do with sda2. I would probably boot onto a live cd and do the work from there. Then you need to update your initrd so it boots properly > > greetings, > jonas -- Clay's Conclusion: Creativity is great, but plagiarism is faster.
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