I've been using a Dell MD3K, configured as one Datastore, with a couple R610 servers running ESXi and am adding storage via a MD1K. The original MD3K is in Unified Mode, as I understand the MD1K needs to be in to support daisy chain. I'll have to verify firmware versions when I have the MD1K connected. The MD3K is good to go at 07.35.39.60. Have not yet connected the 1K because I'm not sure how to cable. Reading the Dell manual and looking at their connection scenarios, they seem to omit the configuration I'm using for the (MD3K) host controller. Simple enough to connect MD3K controller 0 out to MD1K EMM 0 in, but I have both R610 servers connected to each MD3K controller. In MDSM I don't quickly find which path is preferred and which path available for failover, but I've had them fail, then resolved and had to fail back to the preferred path to get back to optimal operation. If I connect, as they say, MD3K controller 0 out to MD1K EMM 0 in, does that set me up for no access to the MD1K if the 0 path is preferred and fails? Is it even more complicated and depend on server AND MD3K path? The way I understand what I'm reading, I don't use the MD1K EMM 1 in port at all unless I have split both racks and connect to different servers. That's a bit of a conflict in their statement of non-support for split rack in daisy chain. Do I need to simplify my cabling from servers to MD3K with single paths to controller 0?