[Crash-utility] kdump and lvm ?

I'm trying to get kdump working on our RHEL5 servers, but am failing to get any dumps. After I trigger a crash, it starts booting the kdump environment, but quickly fails with messages about (from memory): Imported volume group "rootvg" OK. Failed to find logical volume /dev/mapper/-swaplv Failed to find logical volume /dev/mapper/-rootlv Failed to find logical volume /dev/mapper/-varlv Failed to find logical volume /dev/mapper/-locallv and dumps me into the shell. I checked the /dev/mapper directory, and found the expected /dev/mapper/rootvg-swaplv, /dev/mapper/rootvg-rootlv, etc.. So the problem seems to be that kdump is eating up the "rootvg"-part of the device name. Is this a known problem? Any ideas for how to fix it ? Another thing.. anybody know if it's possible the redirect the kdump output to netconsole ? That would be very nice for capturing the reason when it fails.. -jf