We have a HDS array which has EMC VNX as its external array. On getting the arraygroup information, under the VolumeConnection, it gives externalDevNum as -1 whereas if HDS is virtualized with another hitachi array as backend array, then it returns a value under externalDevNum. Why do we get -1 when external array is EMC?
Also I do see that there is an element as ExternalPathInfo returned, it also returns externalWWN and externalLun. However this externalLun does not match with externalDevNum. How do we relate the ExternalPathInfo and VolumeConnection information?