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

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