Pb converting LVM partitions on Linux

Hi,

This afternoon I was converting a Linux Redhat 4.0 EL booting on VmWaconverter CD.

I had systematicaly a crash with converting LVM. In fact I supposed it was due to LVM but I'm not sure I think it could strongly coming from a double attachment on our SAN and thses volumes were mounted on the linux (LVM volumes).

So first did someone can tell me if this kind of Pb comes from LVM or double attachment ? 

And in both cases is there a workaround ?

Thx