Hi,
I have 3 IBM server hosts (Server 2012) and 2 ds3500 SANs connected through fiber channel through a switch. The VMs and SANS are clustered. The MPIO setting is Active/Optimized and Standby for the controllers (seems to be required for the ds3500). The last two times the hosts rebooted (during Cluster Aware Updating) the Active/Optimized and Standby settings got reversed for some of the CSVs and connection was lost. That caused some of the VMs to fail. (No failover.) I had to go into Disk Management on all the hosts and reset the Active/Optimized and Standby paths, then restart the VMs. Anyone have any idea why the MPIO settings are not sticking? Thanks.