This will restore your mksysb image on node7 (bos.obj.f1n7.012804 – or whatever name) to node3. You will have to restore your data in whatever method you use for recovery, e.g., TSM, savevg, etc.
spchvgobj -r rootvg -p PSSP-3.2 -v aix433 -i bos.obj.ssp.432 –c 1 -l 3
spbootins -s no -r install...