Common Path Single Path

In Figure 1, the NIC\HBA, NIC\HBA-to-switch cable, and the port that this cable uses are on the common path to all storage. The other cables and ports to the controllers are on their own paths so that a failure on them does not affect the others. This type of configuration is referred to as single path.

Figure 1. Common path configuration

Important notes:

1.      Do not assign the iSCSI ports to the same network segment as the management interface (except for RL model). 

2.      Each iSCSI port on the respective controller needs to be on a different network segment (ETH2 and ETH3 cannot be on the same segment for that controller)

3.      The Ethernet port ETH2 for controller A and controller B should be in one segment.

4.      The Ethernet port ETH3 for controller A and controller B should be in different network segment.

5.      If VLANs are not present both controller ports will respond to a ping to either port on the same controller even though the subnet is different

6.      Failover requires that the iSCSI port IP address be static. Do not enable DHCP if you have a failover configuration          

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