HP Surestore 6164 QuickLoop User's Guide - Page 22

Dual-switch QuickLoop In a dual-switch QuickLoop, the initialization process is driven by one of the switches, called the QuickLoop master. The role of the QuickLoop master is dynamically assigned at each instance of QuickLoop initialization, according to the following criteria: • If one switch receives LIPs from its looplets and the other does not, the switch that receives the LIPs is the QuickLoop master. • If both switches receive LIPs from their respective looplets, the switch with the lower domain ID is the QuickLoop master. QuickLoop Initialization QuickLoop initialization includes two passes: • Pass 1 Sequential looplet initialization Allows each device in a looplet to obtain a unique AL_PA. • Pass 2 Full QuickLoop initialization Brings QuickLoop up to operation. If Zoning is in use, the looplets that are initialized depend upon the zoning configuration. Pass 1: Sequential Looplet Initialization This pass allows each device in the QuickLoop to obtain a unique AL_PA in a single AL_PA space. Only those looplets from which LIPs were received are initialized, using the loop initialization procedure described in the FC-AL standard. The AL_PAs of devices in looplets from which no LIPs are received are preserved during initialization. Pass 2: Full Initialization This pass sets up the QuickLoop as a single logical PLDA. This is accomplished by making all assigned AL_PAs addressable by any device in the QuickLoop, regardless of whether the destination device and source device are in the same physical looplet. If the destination and source devices are not in the same physical looplet, the hidden FL_Port in the source device looplet acts on behalf of the destination device, the hidden 22 QuickLoop User's Guide