Yes you could configure with 1 coordinator disk on one array and 2 on the other.
Other methods of avoiding splitbrain include:
1) the use of multiple heartbeats (add low priority links over public links),
2) the use of the preonline_ipc script Note: it is located in the sample_triggers directory, move to the triggers directory and turn on Preonline for service groups to cause the trigger to ping for the IP in the SG prior to online, (if you understand Perl, read the script, it also checks to see if it is isolated (no public IP links working, etc)
3) insuring that the LLT links are over totally independent hardware infrastructure (no shared lines or switches).
IF you lose the array with 2 of the coordinator disks and one system goes down, the other will not be able to get a majority of the coor disk and will also panic, on reboot the system seeing only one coord disk cannot start without intervention. In this case you must weigh the value of saving your data from corruption via split brain against the cost of intervention in this case.
