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

Mon Feb 18 15:24:18 CET 2013

'Twas brillig, and Olivier Thauvin at 18/02/13 12:48 did gyre and gimble:
+> So ok, I just update my freshly installed mga2 to cauldron using network
+> install (live upgrade don't work, it seems urpmi fail to find a way to
+> update the system w/o filesystem).
+> 
+> I have the exact same result: it don't boot.
+
+Hmm, re: live upgrade are you meaning just a urpmi based upgrade? If so,
+I've done a few similar updates in the last week or so in VMs and it's
+always been OK. I presume you installed the mageia-prepare-upgrade
+package from mga2/core/updates_testing, rebooted to the boot menu entry
+created by that package before upgrading?
+
+If so, please detail the process you went through and at which point if
+failed so I can debug this process more. I've not had many complaints
+about it, and it's worked for a variety of different filesystems
+structures for me, so I'm surprised it's failing here.
+
+
+
+Regarding the network install based upgrade there may be issues relating
+to bootloader config tools (in drakx) that related the use of the blkid
+cache which might make it miss the whole LVM volume (I've seen it
+manifest itself as putting "root=/dev/" into grubs menu.lst rather than
+"root=/dev/mapper/foo").
+
+I've fixed the calls in drakxtools, but it'll need a release to
+propagate it through to stage2 used there which I don't think has been
+done yet. I'll try and prep that tonight.
+
+> * Colin Guthrie (mageia at colin.guthr.ie) wrote:
+>>
+>>> 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.
+> 
+> rd.lvm.lv=sagittarius/swap
+
+OK, so this basically means that only the swap partition is configured
+to be activated in the initrd (which is also what you observe so at
+least it's behaving at that level!)
+
+The problem is that dracut itself is not detecting that the LV needs
+activating when it runs.
+
+
+In order to get a booting system, just pass "rd.lvm.lv=sagitarius/slash"
+on the command line (obviously substituting the real name of your
+logical volume). This should make dracut initialise the lvm automatically.
+
+You should (at least in theory) also just be able to type something like
+"lvm vgchange -ay" into the dracut shell, then type exit (perhaps twice)
+to continue the boot process.
+
+
+Of course if your grub menu entry has been messed up (root=/dev/) then
+you'll need to fix that up too.
+
+Hopefully that should get you booting.
+
+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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+