Thomas Olschewski wrote:
> Hi,
>
> I have 2 USB HDDs with one partition each combined in an LVM. Due to service
> operations the PC was shut down. After reboot the lvm didn't start again.
> The disks and their partitions are available, but the lvm device isn't
> created, mounting fails and boot process stops. In /etc/lvm/backup I found
> data about the former lvm system.
>
> How can I reconstruct the lvm without data loss?

A distribution like SUSE has a really good rescue mode. You can
basically scan for your lvm devices and (most likely) then rebuild
your initrd (I'm thinking your root is under LVM??). Regardless,
the best thing to do probably is to boot a rescue image that
has the LVM tools and start there.

I know that's not much to go on... you'll have to provide a lot more
information before I could issue a command-by-command recommendation.