Checking multipathing in Windows

To check what multipathing 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

 

MPIO Disk1: 08 Paths, Round Robin, Symmetric Access
Controlling DSM: Microsoft DSM
SN: 6002AE000000013B006E3B

Supported Load Balance Policies: FOO RR RRWS LQD WP LB

    Path ID          State              SCSI Address      Weight
———————————————————-
0000000087060003 Active/Optimized   005|000|003|001   0
* TPG_State : Active/Optimized  , TPG_Id: 256, : 124

    0000000087060002 Active/Optimized   005|000|002|001   0
* TPG_State : Active/Optimized  , TPG_Id: 256, : 122

    0000000087060001 Active/Optimized   005|000|001|001   0
* TPG_State : Active/Optimized  , TPG_Id: 256, : 24

    0000000087060000 Active/Optimized   005|000|000|001   0
* TPG_State : Active/Optimized  , TPG_Id: 256, : 22

    0000000087060003 Active/Optimized   004|000|003|001   0
* TPG_State : Active/Optimized  , TPG_Id: 256, : 123

    0000000087060002 Active/Optimized   004|000|002|001   0
* TPG_State : Active/Optimized  , TPG_Id: 256, : 121

    0000000087060001 Active/Optimized   004|000|001|001   0
* TPG_State : Active/Optimized  , TPG_Id: 256, : 23

    0000000087060000 Active/Optimized   004|000|000|001   0
* TPG_State : Active/Optimized  , TPG_Id: 256, : 21

 

 

 

 

 

 

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3 thoughts on “Checking multipathing in Windows

  1. This is an insanely stupidly complicated process. This is windows – whatever happened to the “simple point-and-click solution?”

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