NetApp Clustered ONTAP 8.2, iSCSI, and MPIO with Server 2012: Part 5/5

In this 5 part series, we:
Part 1: Configure iSCSI on Clustered Data ONTAP
Part 2: Set up Windows Server 2012 with iSCSI and MPIO, NetApp Host Utilities, NetApp DSM for MPIO
Part 3: How to install NetApp SnapDrive for Windows 7.0
Part 4: Use NetApp SnapDrive for Windows to create a disk and attach via iSCSI
Part 5: Use the NetApp Data ONTAP DSM to manage paths and modify MPIO path policies

Part 5: How to use the NetApp Data ONTAP DSM 4.0.1 to manage paths and modify MPIO path policies

5.1) Open the Computer Managemant MSC (Start> Run> compmgmt.msc)
5.2) Select ‘Data ONTAP DSM Management’

Image: Data ONTAP DSM 4.0.1 showing two Active/Optimized paths!

5.3) Select the disk created in Part 4
In the ‘Actions’ pane click ‘Properties’
Review the available Default Load Balancing Properties
Click OK

Image: Data ONTAP DSM 4.0.1 Properties

5.4) Review the information on the I/O Statistics tab

Image: Data ONTAP DSM 4.0.1 I/O Statistics

Appendix A: Data ONTAP DSM 4.0.1 Default Load Balance Properties

Auto Assign
Failover Only
Round Robin
Round Robin with Subset
Least Weighted Paths
Least Queue Depth

Note: “The default load balance policy setting determines the load balance policy assigned to new virtual disks. Changing this setting has no effect on existing virtual disks.” Either disconnect and then reconnect disk (using SnapDrive) or reboot the server to get the new load balancing policy to apply.

Image: Data ONTAP DSM 4.0.1 disk with the ‘Round Robin’ Load Balance Policy

Appendix B: Data ONTAP DSM 4.0.1 Available I/O Statistics

Disk ID
Path ID
Operational State
Total Reads
Total Writes
Total Bytes Read
Total Bytes Written
Total Failovers
Total I/O Errors
Total Outstanding Requests