Boot fails after change of motherboard (using LVM)

[Volker Englisch]

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.

-- 
Thanks

     Volker Englisch

mailto:Volker at Englisch.us    (h)