Hello,   The only downside including both subnets in the HIT MPIO, is that it will periodically attempt to connect to one group with NICs on the other subnet.   The connectivity check will fail and just use NICs that can reach the appropriate group. 
Is there a supported and good way to do it? The setup looks like this: - Group 1 in subnet A (1Gb SAN, older) - Group 2 in subnet B (10Gb SAN, newer) - Host has connections to all subnets through different NICs, is a Windows server, has HIT Kit and working MPIO to group A - Subnet A and B are physically and logically separate, no traffic can flow directly from one to the other I'd like to use the host to be able to access and move data on and between both groups (application using host-based mirroring, etc). HIT/ME only supports one MPIO-setting per host, so that's obviously the first thing to be "not ok" as I'd have to include both subnets A and B. What catastrophes should I expect if I decide to do it anyway? Will this ever be a supported scenario (and HIT/ME have support for multiple MPIO configurations, one set per group f.ex.)?
Connect a host to EQL groups in separate SANs