I have a problem with my VMware ESXi 5.1 host servers losing access to the LUNs on my MSA 2040 dual controller-SAS too.  The HBA is a H221.   Can anyone tell me a solution here?   We have v2 CPUs used.    HP can't even tell me what is the proper SAS cable to use between the H221 and the MSA 2040.  What are others using for the cable (Part #??).   Anyone FIX this issue??  I'm dealing with support right now from HP, but they're clueless as to what's going on.  LUNs are constantly disappearing until a reboot the host, then it's fine for a few hours before losing the LUNs again.