It might be a worthwile community project to write documentation for these undocumented commands. getlvodm, for instance, i have used literally for decades now (it must...
To be honest, i haven't seen that part of the LVM redbook (or maybe i have but couldn't remember). Fact is that there is no man page for the command, it is not mentioned in IBMs online documentation...
In principle it is possible to create FSes on shared volume groups with cluster methods (also known as C-SPOC), either from the command line or using the respective SMIT menus. In practice, however,...