I have successfully imported VGs, and they're still there after a reboot. But after a shutdown I have to import them again.
Have you already run:
importvg -y <vgname> <hdisk_number>
If you have to run
importvg after every shutdown and restart to restore the volume groups, check the
lsattr -El sys0 | grep dev
If output from the above command shows that clouddev and ghostdev are enabled, please disable both settings:
chdev -l sys0 -a ghostdev=0
chdev -l sys0 -a clouddev=0
This should ensure that your VGs remain known to the ODM across shutdowns.
I don't have any right now.