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iscsi MPIO Hyper V query

Posted on 2012-09-14
Medium Priority
Last Modified: 2012-10-24

I have the following HyperV setup I am configuring

Server with 2 teamed NICS connected to switch1 for LAN connectivity
Same server with 2 GB NICS set up on different LAN switch for iscsi and HP P2000 SAN connected with the switch.

iSCSI and MPIO has been installed and configured, but I noticed one of the MPIO path details showed source portal as and the other showe the correct IP address for the 2 NIC on the server. Is this correct? (attached screen shot)

What is the best algorithm for the load balance. Is Round Robin Subset the right one?

During my testing I noticed one NIC seemed to be used for the iscsi traffic., should that be the case with round robin?

I noticed was that there seemed to be a 20 second delay when testing a NIC failure by unplugging one of the iscsi NIC cables before the other would take over and the virtual servers would respond again. Is that normal behaviour? Can this delay be shortened?

Last question, is it best practice to set each port for iscsi switch to use jumbo frames? and is there noticeable benefit in performance.
Question by:MickJackson
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LVL 10

Expert Comment

by:Shani Basha
ID: 38429039
Do you installed iSCSI storage vendor's DSM for the MPIO?

Round Robin would be the ideal Load-balancing policy setting that allows the DSM to use all available paths for MPIO in a balanced way.
Yes, you can enable jumbo frames, but make sure your switch supports the frames

Author Comment

ID: 38436938

Thanks for the update. I was able to get iscsi to MPIO to show 4 host adapater IP's to 4 targets.

One thing I have noticed is that although all 4 adapters show as active with round robin and subset, only the first 2 network adapters show any utilisation in task manager. Have I missed something here??
LVL 10

Expert Comment

by:Shani Basha
ID: 38467828
Is the other adapters being used for any other traffic?

Accepted Solution

MickJackson earned 0 total points
ID: 38516854

In the end the solution was down to more configuration needed for the iscsi initator.

As i had 4 nics and 4 targets I had to add each potential route into the iscsi discovery portal. This then fixed te issue and all 4 nics are now in use for iscsi traffic.

thanks for your assistance

Author Closing Comment

ID: 38529342
My solution worked

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