MPIO: How to set a Path State active/optimized?

Hi,

I've got a problem with my MPIO settings, for some reason data transmissons between servers and storage only use one out of two paths.

Win2012R2

MPIO installed

MPIO feature configured

storage supports MPIO

LB Policy: RRWS

Registered DSMs: 1
================+--------------------------------|-------------------|----|----|----|---|-----+
|DSM Name                        |      Version      |PRP | RC | RI |PVP| PVE |
|--------------------------------|-------------------|----|----|----|---|-----|
|Microsoft DSM                   |006.0003.09600.17088|0130|0006|0001|030|False|+--------------------------------|-------------------|----|----|----|---|-----+


Microsoft DSM
=============
MPIO Disk5: 02 Paths, Round Robin with Subset, Implicit Only
        SN: 60A9803830304C2F5D4559562F5278                                  
        Supported Load Balance Policies: FOO RRWS LQD WP LB

    Path ID          State              SCSI Address      Weight
    ---------------------------------------------------------------------------
    0000000077030001 Active/Unoptimized 003|000|001|001   0
        TPG_State: Active/Unoptimized, TPG_Id: 1001, TP_Id: 3
        Adapter: Microsoft iSCSI Initiator...              (B|D|F: 000|000|000)
        Controller: 46616B65436F6E74726F6C6C6572 (State: Active)

    0000000077030000 Active/Optimized   003|000|000|001   0
        TPG_State: Active/Optimized  , TPG_Id: 1000, TP_Id: 1
        Adapter: Microsoft iSCSI Initiator...              (B|D|F: 000|000|000)
        Controller: 46616B65436F6E74726F6C6C6572 (State: Active)

MPIO Disk4: 02 Paths, Round Robin with Subset, Implicit Only
        SN: 60A9803830304C2F5D4559562F5277                                  
        Supported Load Balance Policies: FOO RRWS LQD WP LB

    Path ID          State              SCSI Address      Weight
    ---------------------------------------------------------------------------
    0000000077030001 Active/Unoptimized 003|000|001|000   0
        TPG_State: Active/Unoptimized, TPG_Id: 1001, TP_Id: 3
        Adapter: Microsoft iSCSI Initiator...              (B|D|F: 000|000|000)
        Controller: 46616B65436F6E74726F6C6C6572 (State: Active)

    0000000077030000 Active/Optimized   003|000|000|000   0
        TPG_State: Active/Optimized  , TPG_Id: 1000, TP_Id: 1
        Adapter: Microsoft iSCSI Initiator...              (B|D|F: 000|000|000)
        Controller: 46616B65436F6E74726F6C6C6572 (State: Active)

MSDSM-wide default load balance policy: N\A

No target-level default load balance policies have been set.

================================================================================

If I disabled the path marked as "active/optimized", then the other path "active/unoptimized" will take over....but wehn both are enabled, only the "active/optimized" path is used.

How can I change the path setting of the "active/unoptimized" to "active/optimized"? I've alreday tried to change it via disk management->properties->mpio, but wehn I want to apply the settings I get an error message:

BR

..next time we eat bacon