For systems running 7-Mode in Data ONTAP 8.x, you use the storage array show-config command to list the array LUNs that the storage system can access, and to check that each array LUN is visible through both paths.
LUN Group Array Name Array Target Ports Switch Port Initiator Group 0 (4 LUNS) HP_HSV210_1 50:00:1f:e1:50:0a:86:6d vnmc4300s35:11 0b 50:00:1f:e1:50:0a:86:69 vnbr4100s31:15 0c Group 1 (4 LUNS) HP_HSV210_1 50:00:1f:e1:50:0a:86:68 vnbr4100s31:1 0a 50:00:1f:e1:50:0a:86:6c vnmc4300s35:6 0d Group 2(50 LUNS) HP_HSV200_1 50:00:1f:e1:50:0d:14:6d vnbr4100s31:5 0a 50:00:1f:e1:50:0d:14:68 vnmc4300s35:3 0d
LUN Group Array Name Array Target Ports Switch Port Initiator Group 2 (50 LUNS) HP_HSV200_1 50:00:1f:e1:50:0d:14:68 vnmc4300s35:3 0d 50:00:1f:e1:50:0d:14:6d vnbr4100s31:5 0a (20 LUNs) HP_HSV200_1 50:00:1f:e1:50:0d:14:69 vnmc4300s35:2 0e
The following shows output from storage array show-luns:
Name WWPNs vnmc4300s35:3.127L1 50:00:1f:e1:50:0d:14:68, 50:00:1f:e1:50:0d:14:6d vnmc4300s35:3.127L2 50:00:1f:e1:50:0d:14:68, 50:00:1f:e1:50:0d:14:6d vnmc4300s35:3.127L3 50:00:1f:e1:50:0d:14:68, 50:00:1f:e1:50:0d:14:6d . . . vnbr4100s31:5.126L49 50:00:1f:e1:50:0d:14:6d, 50:00:1f:e1:50:0d:14:68 vnmc4300s35:3.127L50 50:00:1f:e1:50:0d:14:68, 50:00:1f:e1:50:0d:14:6d vnmc4300s35:3.127L51 50:00:1f:e1:50:0d:14:69, vnmc4300s35:3.127L52 50:00:1f:e1:50:0d:14:69, . . . vnbr4100s31:5.126L53 50:00:1f:e1:50:0d:14:69, vnbr4100s31:5.126L70 50:00:1f:e1:50:0d:14:69,
LUNs 1 through 50 make up Group 2, the array LUNs configured with two ports as shown with the storage array show-config command. LUNs 51 through 70 are the 20 LUNs that contain a single path connected only to Port 50:00:1f:e1:50:0d:14:69 of the storage array.
A single path indicates a configuration problem. The second path can have a problem at the FC initiator port on the Data ONTAP system, the switch, or the storage array port.