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Old 03-09-2009, 02:43 AM   #1
gaxi
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Kernel Panic at boot when PV missing from VG (LVM)


Hi,

I installed a server with Centos 5.2 on a machine with two physical sata-harddisks.

I used LVM to create a mirror for the two LVs, the root-LV plus one data-LV. (with lvcreate/lvconvert). I only have two disks so I used ócorelog.

For testing reasons I simulated the failure of one harddisk and shutdown and removed /dev/sda (with /boot on it).
I created a boot-CD with mkbootdisk before. The boot-CD does not start the system but brings a kernel-panic because one PV is missing.
I don't have a clue how to remove the failed PV from a system which cannot boot.

Of course I already googled a lot for this problem but did not find a proper solution.

Did I miss a detail? Is mirroring of LVs with LVM (with corelog) a usable solution for harddisk-failures?

gaxi
 
Old 03-10-2009, 03:06 PM   #2
TBC Cosmo
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Registered: Feb 2004
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Distribution: Fedora 10, CentOS 5.4, Debian 5 Sparc64
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I found this:
http://prefetch.net/blog/index.php/2...lvm-silliness/
and this:
http://www.redhat.com/docs/manuals/e...or_create.html

Seems corelog is logging sync changes in memory. So after boot, those changes are gone.

You may try seeing if you can repair by booting into a rescue environment, provided LVM will give you tools to recover.

Last edited by TBC Cosmo; 03-10-2009 at 03:12 PM. Reason: Add link and comment
 
  


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