Hello,
using lvm under Debian woody with packages lvm-common v1.5.5 and lvm10 v1.04-5 and linux 2.4.21 I once had a
volume group vg0 with three physical volumes:
/dev/scsi/host0/bus0/target5/lun0/part1 /dev/scsi/host0/bus0/target3/lun0/part1 /dev/scsi/host0/bus0/target4/lun0/part6
Unfortunately the first disk failed, but while Linux was still up I could still access some of the files. That obviously changed after I rebooted the system as the first disk was hopelessly broken and vg0 could no longer be activated.