Does the FAS2040 need two controllers to be able to use DSM-MPIO? I have several HP windows servers (2008 R2) that have two iscsi adapters connecting to two different Cisco switches (with each switch having a connection to the one storage controller). One switch goes to a VIF of ports eoa and eob (ip=10.x.x.10), the other switch goes to port eoc(ip=10.x.x.14). Port eod is to the network. The iscsi initiator has both ip's added, but I'm thinking that only one ip is actually "live". Telneting into the FAS2040 I can only ping one of the iscsi adapters in each of the Windows servers. Shouldn't I be able to ping both iscsi adapters? btw, we get many iscsi errors in the system event log.
In general DSM/MPIO does not require two controllers for its working.It should work with single controller but still with redundancy by having multiple ports of the controller through different HBA's/Switches or without any redundancy by having just single path.The controllers can be in active/active or active/passive modes when there are two, depending on the storage.However host should be able to ping both the controllers if they are configured correctly for network access always.