this is from the same solution you mentioned earlier:  The highest level of availability can be achieved by binding the Primary and Secondary for each RAID 1 pair are on different buses (i.e. not just different enclosures on the same bus).  However this does add to the complexity of configuring FAST Cache, because the configuration would need to be done using the secure CLI.  This is not considered necessary for most implementations, but is done to further reduce the chances of multiple drive failures (which are already unlikely).
Hello all,  I just need to provision FAST Cache for my array (CX4-480).  I have 4 available disks that I split into two buses excluding 0_0.  Documents "EMC FAST Cache, A Detailed Review" and emc251589 are very useful, but I need advise whether I configure my mirror(s) as 2 sets of 2 disks or 1 set of 4.   What would be a better setup and why if you can answer.  I appreciate your help.
FAST Cache Setup (2 or 4)