The wizard detected that this system is in a sysplex and is participating in the shared HFS function.
The panel is asking whether you want ownership of the file system you are adding to automatically move to another system in the case of system failure. If you check "Yes", meaning AUTOMOVE, and the system fails, ownership of the file system moves to another system. If you check "No", meaning NOAUTOMOVE, and the system fails, the file system will become inaccessible.
You can find more detailed help on the following elements of this window:
If this system fails, automatically change ownership to another system (AUTOMOVE) ?