Loss of connection with storage

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.

A few notes:
This seems to be a vendor provided MPIO - not the Microsoft MPIO. If so, then it's best suited for a discussion with vendor support.
Do you have a quorum disk for your cluster? If not, I recommend adding a quorum disk regardless of the number of hosts. I'm assuming default quorum configuration.
Also, consider upgrading to 2012 R2. There has been significant improvements with storage and clustering.
Sam Boutros, Senior Consultant, Software Logic, KOP, PA http://superwidgets.wordpress.com (Please take a moment to Vote as Helpful and/or Mark as Answer, where applicable) _________________________________________________________________________________
Powershell: Learn it before it's an emergency http://technet.microsoft.com/en-us/scriptcenter/powershell.aspx http://technet.microsoft.com/en-us/scriptcenter/dd793612.aspx

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