[Mageia-dev] System doen't boot with LVM

Mon Feb 18 13:01:49 CET 2013

'Twas brillig, and Olivier Thauvin at 18/02/13 11:19 did gyre and gimble:
+> I rebooted my laptop this morning and it failed to boot: unable to find
+> my / under lvm.
+
+Freshly updated cauldron booted fine for me this morning under LVM.
+
+> I did try to do a fresh cauldron result but got same result.
+
+Apparently there are some issues doing an LVM install at present:
+https://bugs.mageia.org/show_bug.cgi?id=9032
+
+Likely in some capacity an issue with lvm+udev (the linked bugs are
+likely not the same cause).
+
+> Dracut gi a shell, It seems 'lvm vgmknodes' has no effect (the swap lv
+> did existed already).
+
+In the dracut shell, what does /etc/cmdline.d/lvm.conf say? It should
+contain enough info to brink up both the root and the swap lvm.
+
+Note that the swap lvm is included thanks to the file
+51-mageia-resume.conf (to handle the resume= case where swap is on LVM),
+but the root FS detection is built into dracut, so if it's entry is
+missing in the cmdline.d file then dracut itself is where the bug lies.
+
+
+Which version of dracut did you use to create the initrd used here? If
+it was dracut-025.1 then I think this is understandable as there was a
+bug related to something similar relating to encrypted filesystems (it
+didn't affect me here with pure LVM (no crypt), so it may not be the
+issue you have) If it's still a problem with dracut-025.3 then I'll need
+to look further.
+
+As mentioned, problem fixed seemed to manifest itself more with the fact
+that the encryption module wasn't included, but if you have an encrypted
+root (or the LVM is on an encrypted volume) then I can see this causing
+problems (due to not detecting the encrypted volume, it won't then
+traverse it to find any slaves needed for it and thus never get to the
+LVM parent) and the 025.3 dracut should fix it (at least in theory, tho'
+I would not rule out any other problems in this regard!
+
+So some more info about when the initrd was generated and when the
+latest dracut version was installed would be useful to debug this
+further. Also a description of your disk layout would be good too allow
+me to create a similar setup for debugging.
+
+Cheers :)
+
+Col
+
+
+
+
+-- 
+
+Colin Guthrie
+colin(at)mageia.org
+http://colin.guthr.ie/
+
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+  Tribalogic Limited http://www.tribalogic.net/
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+