Quick overview of our environment:
2012 R2 Hyper-V host:
- separate VLANs for: Management/VM Access, iSCSI, LiveMigration, Cluster (CSV/Heartbeat)
- NIC teams: Management, VM Access, LiveMigration, CSV/Heartbeat
- Virtual Switches: 1 (tied to VM Access NIC team)
SQL 2012 cluster deployed as VM guests
- SQL databases are on shared VHDXs (VHDXs reside in c:\ClusterStorage on the VM host cluster)
When we run SQLIO to test performance, the Hyper-V hosts show traffic on the LiveMigration and Cluster NIC teams. The traffic picks up when we start the tests, and ends as soon as the SQLIO test stops. Without a doubt, it is being caused by SQLIO.
Does anyone have any insight as to why these networks are showing activity during the SQLIO tests?