Ok, after Dell tried about 5 different times to tell me my configuration was unsupported (they actually claimed that EPA software wasn't supported!) I finally got someone that gave me a workaround: disabling ODX by changing the reg key HKLM\SYSTEM\CurrentControlSet\Control\FileSystem\FilterSupportedFeaturesMode from 0 to 1. Doing this "fixes" it, but it also takes away one of the coolest features of Server 2012 + EqualLogic: ODX! With ODX enabled, I can move 20GB in < 1 sec. With it disabled, it takes around 2 minutes, depending on network congestion. 
Well I'm stumped! Been banging my head against this all week. Basically, moving a clustered VM between LUNs on the EqualLogic array corrupts the VM. Here's my setup:
PS6100XS and Hyper-V Server 2012 cluster: migrating storage between LUNs 
corrupts VM