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I am using Win2008 32bit Ent. running in Hyper-V with 2 LUNs over ISCSI connection (this is a MS cluster with one LUN being quorum and second as a storage). In ISCSI -> target -> details I see multiple sessions from same target (currently 7), however I am not sure where they are coming from as I have only one virtual NIC on this server. Sure enough 2 LUNs appear 7 times each in device manager or in disk manager. On the cluster partner however, I do not see that problem. There is only one session per target. Installing MPIO makes only difference - I am getting 8 sessions instead of 7 once I reboot.

Does any one know what can cause this behavior?

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How is your iscsi target configured? IIRC you should configure a SCSI ID to avoid duplicates with Hyper-V. –  wazoox Mar 9 '10 at 10:38
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2 Answers

That's normal behavior. It creates separate sessions for every possible combination of network routes. So if any routes fail, the others pick up the slack.

See these links for more info: Understanding MPIO and Configuring MPIO

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Sessions and connections

you will see a New LUN for each Session in windows 7 sessions 7 luns.

It sounds like you want to make Multiple Connections not sessions

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