Re: Boot fails after change of motherboard (using LVM)

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Volker Englisch wrote:
I have a problem I'm trying to solve and I'm hoping someone here might know a solution.

I am running FC4 (with AMD64) and was able to boot the machine without problems until last Friday when I had to change my motherboard. Since then it appears that I'm unable to boot because the system can not find my LVM. I see this error message after grub selected the OS:
  Red Hat nash version 4.2.15 starting
     Reading all physical volumes. This may take a while ...
     No volume groups found
     Unable to find volume group "VolGroup00"
and as a result a kernel panic.

I can start the machine by using the installation disk and boot with 'linux rescue' and then I can see my volume and access the data.

I have two SATA hard drives with a /boot partition and the volume group on the first one and the second HDD has just regular partitions:
  Filesystem                       Size   Used  Avail Use%  Mounted on
  /dev/mapper/VolGroup00-LogVol04   15G   7.2G   6.4G  54%  /var
  /dev/mapper/VolGroup00-LogVol03   34G    12G    20G  37%  /backup
  /dev/mapper/VolGroup00-LogVol00   24G   7.9G    15G  35%  /
  /dev/sda1                         99M    29M    65M  31%  /boot
  /dev/sdb3                        138G    18G   113G  14%  /free
  /dev/mapper/VolGroup00-LogVol02   29G   3.4G    24G  13%  /home
  /dev/sdb2                         46G   1.2G    43G   3%  /home/public
  /dev/sdb1                         46G   706M    43G   2%  /home/mail

Here is the content of my grub.conf
  #boot=/dev/sda
  default=0
  timeout=5
  splashimage=(hd0,0)/grub/splash.xpm.gz
  hiddenmenu
  password --md5 $1$n/QZG.cU$Cp6m9OIRXtaldLKLpJUE61
  title Fedora Core (2.6.17-1.2142_FC4)
     root (hd0,0)
kernel /vmlinuz-2.6.17-1.2142_FC4 ro root=/dev/VolGroup00/LogVol00 rhgb quiet
     initrd /initrd-2.6.17-1.2142_FC4.img
  title Fedora Core (2.6.17-1.2141_FC4)
     root (hd0,0)
kernel /vmlinuz-2.6.17-1.2141_FC4 ro root=/dev/VolGroup00/LogVol00 rhgb quiet
     initrd /initrd-2.6.17-1.2141_FC4.img

I already ran
  $ grub-install /dev/sda
but that didn't change anything.

I'm not even sure if this problem is related to grub or to another process later in the boot sequence.

Thanks for your help.

I'd suspect that the new MB has a different SATA controller and that's not built into the initrd that's on the machine. Boot the machine with the rescue CD, and get the postinstall and preuninstall scripts using " rpm -q kernel --scripts". Rerun them (preuninstall first) and you'll have a shiny new initrd which should do the trick.

Jeff Voskamp

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