Checking MPIO in Windows
To check the MPIO settings a Windows server is using you can use the command line utility mpclaim.
To check the policy your volumes are currently using:
mpclaim -s -d MPIO Disk System Disk LB Policy DSM Name ----------------------------------------------------- MPIO Disk1 Disk 2 RR Microsoft DSM MPIO Disk0 Disk 1 RR Microsoft DSM
The multipathing load balancing policy is shown under LB policy so in the above case RR for Round Robin.
To view the number of paths there are to a volume enter the command mpclaim -s -d followed by the system disk number you want more details on. For example:
mpclaim -s -d 1
