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Path groups are divided based upon path group policy.
Path Grouping Policy Determines how the path group(s) are formed using the available paths. There are five different policies: 1. multibus: One path group is formed with all paths to a LUN. Suitable for devices that are in Active/Active mode. 2. failover: Each path group will have only one path. 3. group_by_serial: One path group per storage controller(serial). All paths that connect to the LUN through a controller are assigned to a path group. Suitable for devices that are in Active/Passive mode. 4. group_by_prio: Paths with same priority will be assigned to a path group. 5. group_by_node_name: Paths with same target node name will be assigned to a path group.
don't understand the unspecified multipath question, care to expound?