You can easily check MPIO path configuration and also disk information with "mpclaim" command in windows. At this example, the balance policy is Round Robin. Multipathing balance policy is shown under "LB Policy".There are 5 types of policy that you can define for windows.
| Parameter Value | Description |
| FOO | Fail Over Only. |
| RR | Round Robin. |
| LQD | Least Queue Depth. |
| LB | Least Blocks. |
| None | Currently configured default load balance policy. |
C:\Windows\system32>mpclaim -s -d MPIO Disk System Disk LB Policy DSM Name ------------------------------------------------------------------------- MPIO Disk9 Disk 11 RR Microsoft DSM MPIO Disk8 Disk 10 RR Microsoft DSM
*to check number of paths for a disk, type disk id and of "mpclaim -s -d <diskID>
C:\Windows\system32>mpclaim -s -d MPIO Disk System Disk LB Policy DSM Name ------------------------------------------------------------------------- MPIO Disk9 Disk 11 RR Microsoft DSM MPIO Disk8 Disk 10 RR Microsoft DSM MPIO Disk7 Disk 9 RR Microsoft DSM MPIO Disk6 Disk 8 RR Microsoft DSM MPIO Disk5 Disk 7 RR Microsoft DSM MPIO Disk4 Disk 6 RR Microsoft DSM MPIO Disk3 Disk 5 RR Microsoft DSM MPIO Disk2 Disk 4 RR Microsoft DSM MPIO Disk1 Disk 3 RR Microsoft DSM MPIO Disk0 Disk 2 RR Microsoft DSM C:\Windows\system32>mpclaim -s -d 4 MPIO Disk4: 08 Paths, Round Robin, Symmetric Access Controlling DSM: Microsoft DSM SN: 50002s2AC0001F23sad14 Supported Load Balance Policies: FOO RR RRWS LQD WP LB Path ID State SCSI Address Weight --------------------------------------------------------------------- 0000000077030007 Active/Optimized 003|000|007|004 0 * TPG_State : Active/Optimized , TPG_Id: 256, : 124 0000000077030006 Active/Optimized 003|000|006|004 0 * TPG_State : Active/Optimized , TPG_Id: 256, : 122 0000000077030005 Active/Optimized 003|000|005|004 0 * TPG_State : Active/Optimized , TPG_Id: 256, : 24 0000000077030004 Active/Optimized 003|000|004|004 0 * TPG_State : Active/Optimized , TPG_Id: 256, : 22 0000000077020006 Active/Optimized 002|000|006|004 0 * TPG_State : Active/Optimized , TPG_Id: 256, : 123 0000000077020005 Active/Optimized 002|000|005|004 0 * TPG_State : Active/Optimized , TPG_Id: 256, : 121 0000000077020004 Active/Optimized 002|000|004|004 0 * TPG_State : Active/Optimized , TPG_Id: 256, : 23 0000000077020003 Active/Optimized 002|000|003|004 0 * TPG_State : Active/Optimized , TPG_Id: 256, : 21
