GDDR operates in a Primary Owner / Non-Owner state in relation to other GDDR control LPARs. For example, in a three site-topology with AutoSwap, the GDDR primary C-System (Control System) would normally reside at the DC2 location. However, if the DC2 location is destroyed, or the GDDR C-System itself fails, then one of the surviving GDDR C-Systems will assume the role of the GDDR Primary.
Changes to GDDR configuration information can only be made on the GDDR primary C-System. GDDR propagates these changes to the subordinate GDDR systems using inter-system communications facilities built into GDDR.
Restart procedures following disasters are coordinated from the GDDR primary C-System.
Customer application systems are referred to as ‘managed systems’ or P-systems to distinguish them from GDDR C-Systems.
