We know that 'chvg -g VG' on non-concurrent Vgs works great after you increase the size of their disks, but in case VGs on concurrent running on PowerHA 6.1? We also know, if we shutdown powerHA, exportvg, importvg also works, but Is possible to do it without downtime?
What about this command:
/usr/es/sbin/cluster/sbin/cl_chvg -cspoc -nnode1,node2 -an -Qn -g VG-Concurrent
Note the "-g" on the command.